75043939 ÷ 539 
The aim is to understand the frequency of 539 in 75043939.

Let's proceed to step 1:
When dividing 7 by 539, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 539

Let's proceed to step 2:
75 divided by 539 is 0 with a remainder of 75.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 75 after subtracting 0 from 75.
Grab the next digit (0) from the dividend, add it to 75, then carry on: 750 / 539

Let's proceed to step 3:
When dividing 750 by 539, we get 1 with a remainder of 211.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 539 from 750 and we're left with 211.
Take the next digit (4) from the dividend and append it to 211, then repeat: 2114 / 539

Step 4:
If we divide 2114 by 539, we get 3 and a remainder of 497.
Write down 3 as next digit of the result. 
Result so far: 13.0
Deduct 1617 from 2114 and we're left with 497.
Fetch the next digit (3) from the dividend, attach it to 497 and continue: 4973 / 539

Going ahead to step 5:
When dividing 4973 by 539, we get 9 with a remainder of 122.
The number 9 becomes the next digit in our result. 
Result so far: 139.0
The remainder is 122 after subtracting 4851 from 4973.
Include the next digit (9) from the dividend after 122, then repeat: 1229 / 539

On to step 6:
When dividing 1229 by 539, we get 2 with a remainder of 151.
The number 2 becomes the next digit in our result. 
Result so far: 1392.0
The remainder is 151 after subtracting 1078 from 1229.
Fetch the next digit (3) from the dividend, attach it to 151 and continue: 1513 / 539

Let's proceed to step 7:
539 can be fit into 1513 2 times, resulting in a remainder of 435.
Use 2 as the next digit of our solution. 
Result so far: 13922.0
Deduct 1078 from 1513 and we're left with 435.
Include the next digit (9) from the dividend after 435, then repeat: 4359 / 539

Step 8:
539 goes into 4359 8 times with a remainder of 47.
The number 8 becomes the next digit in our result. 
Result so far: 139228.0
Subtracting 4312 from 4359 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 9:
When dividing 470 by 539, we get 0 with a remainder of 470.
Record the quotient 0 as the next digit in the result. 
Result so far: 139228.0
If we subtract 0 from 470, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Advancing to step 10:
4700 divided by 539 is 8 with a remainder of 388.
The next digit of our result is 8. 
Result so far: 139228.08
Deduct 4312 from 4700 and we're left with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Moving on to step 11:
539 can be fit into 3880 7 times, resulting in a remainder of 107.
The next digit of our result is 7. 
Result so far: 139228.087
Deduct 3773 from 3880 and we're left with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Advancing to step 12:
539 goes into 1070 1 times with a remainder of 531.
Record the quotient 1 as the next digit in the result. 
Result so far: 139228.0871
Subtract 539 from 1070 to get 531.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5310, and continue the process.

Step 13:
539 can be fit into 5310 9 times, resulting in a remainder of 459.
Write down 9 as next digit of the result. 
Result so far: 139228.08719
If we take 4851 away from 5310, we end up with 459.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4590, and continue the process.

Going ahead to step 14:
539 goes into 4590 8 times with a remainder of 278.
Put 8 as the next digit of the answer. 
Result so far: 139228.087198
If we take 4312 away from 4590, we end up with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Step 15:
539 goes into 2780 5 times with a remainder of 85.
The next digit of our result is 5. 
Result so far: 139228.0871985
Subtract 2695 from 2780 to get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 16:
539 goes into 850 1 times with a remainder of 311.
Use 1 as the next digit of our solution. 
Result so far: 139228.08719851
Subtracting 539 from 850 leaves us with 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

The final outcome is 139228.08719851, with a leftover of 3.11e-07.