We're dividing 75802703 by 399 
The aim is to understand the frequency of 399 in 75802703.

Step 1:
When dividing 7 by 399, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 399

Let's proceed to step 2:
399 can be fit into 75 0 times, resulting in a remainder of 75.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 75, we get 75.
Fetch the next digit (8) from the dividend, attach it to 75 and continue: 758 / 399

Going ahead to step 3:
If we divide 758 by 399, we get 1 and a remainder of 359.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 359 after subtracting 399 from 758.
Include the next digit (0) from the dividend after 359, then repeat: 3590 / 399

Going ahead to step 4:
3590 divided by 399 is 8 with a remainder of 398.
Write down 8 as next digit of the result. 
Result so far: 18.0
If we subtract 3192 from 3590, we get 398.
Bring next digit (2) of the dividend behind the 398 and repeat the process: 3982 / 399

Moving on to step 5:
3982 divided by 399 is 9 with a remainder of 391.
Use 9 as the next digit of our solution. 
Result so far: 189.0
Subtracting 3591 from 3982 leaves us with 391.
Include the next digit (7) from the dividend after 391, then repeat: 3917 / 399

Advancing to step 6:
3917 divided by 399 is 9 with a remainder of 326.
Use 9 as the next digit of our solution. 
Result so far: 1899.0
Subtract 3591 from 3917 to get 326.
Grab the next digit (0) from the dividend, add it to 326, then carry on: 3260 / 399

Moving on to step 7:
When dividing 3260 by 399, we get 8 with a remainder of 68.
The next digit of our result is 8. 
Result so far: 18998.0
If we take 3192 away from 3260, we end up with 68.
Append the next digit (3) from the dividend to 68 and continue with: 683 / 399

Step 8:
399 can be fit into 683 1 times, resulting in a remainder of 284.
Use 1 as the next digit of our solution. 
Result so far: 189981.0
The remainder is 284 after subtracting 399 from 683.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

On to step 9:
When dividing 2840 by 399, we get 7 with a remainder of 47.
Record the quotient 7 as the next digit in the result. 
Result so far: 189981.7
The remainder is 47 after subtracting 2793 from 2840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 10:
399 goes into 470 1 times with a remainder of 71.
The number 1 becomes the next digit in our result. 
Result so far: 189981.71
Deduct 399 from 470 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 11:
When dividing 710 by 399, we get 1 with a remainder of 311.
The number 1 becomes the next digit in our result. 
Result so far: 189981.711
Subtracting 399 from 710 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.

In conclusion, the division gives 189981.711 with a balance of 0.0311.