We're dividing 520728 by 7 
The aim is to understand the frequency of 7 in 520728.

Step 1:
5 divided by 7 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 7

Moving on to step 2:
When dividing 52 by 7, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtract 49 from 52 to get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 7

Going ahead to step 3:
When dividing 30 by 7, we get 4 with a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 74.0
Deduct 28 from 30 and we're left with 2.
Append the next digit (7) from the dividend to 2 and continue with: 27 / 7

Moving on to step 4:
If we divide 27 by 7, we get 3 and a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 743.0
The remainder is 6 after subtracting 21 from 27.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 7

Advancing to step 5:
If we divide 62 by 7, we get 8 and a remainder of 6.
The next digit of our result is 8. 
Result so far: 7438.0
If we subtract 56 from 62, we get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 7

Step 6:
7 goes into 68 9 times with a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 74389.0
If we subtract 63 from 68, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 7:
7 goes into 50 7 times with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 74389.7
Subtract 49 from 50 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 8:
The number 7 fits into 10 1 times, leaving a remainder of 3.
The next digit of our result is 1. 
Result so far: 74389.71
Subtract 7 from 10 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 9:
7 can be fit into 30 4 times, resulting in a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 74389.714
The remainder is 2 after subtracting 28 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
When dividing 20 by 7, we get 2 with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 74389.7142
Deduct 14 from 20 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
If we divide 60 by 7, we get 8 and a remainder of 4.
The next digit of our result is 8. 
Result so far: 74389.71428
The remainder is 4 after subtracting 56 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 12:
40 divided by 7 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 74389.714285
Subtract 35 from 40 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 13:
When dividing 50 by 7, we get 7 with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 74389.7142857
Deduct 49 from 50 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 14:
10 divided by 7 is 1 with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 74389.71428571
Subtracting 7 from 10 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

In conclusion, the division gives 74389.71428571 with a balance of 3e-09.