We look at the division of 686599 by 7 
The aim is to understand the frequency of 7 in 686599.

Step 1:
7 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 7

Advancing to step 2:
When dividing 68 by 7, we get 9 with a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
The remainder is 5 after subtracting 63 from 68.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 7

On to step 3:
56 divided by 7 is 8 with a remainder of 0.
The next digit of our result is 8. 
Result so far: 98.0
Subtract 56 from 56 to get 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 7

Going ahead to step 4:
If we divide 5 by 7, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 980.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 7

On to step 5:
7 goes into 59 8 times with a remainder of 3.
Use 8 as the next digit of our solution. 
Result so far: 9808.0
Subtract 56 from 59 to get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 7

Advancing to step 6:
When dividing 39 by 7, we get 5 with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 98085.0
Subtract 35 from 39 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
7 goes into 40 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 98085.5
The remainder is 5 after subtracting 35 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
7 can be fit into 50 7 times, resulting in a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 98085.57
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.

On to step 9:
If we divide 10 by 7, we get 1 and a remainder of 3.
The next digit of our result is 1. 
Result so far: 98085.571
The remainder is 3 after subtracting 7 from 10.
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 10:
If we divide 30 by 7, we get 4 and a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 98085.5714
Subtract 28 from 30 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 11:
When dividing 20 by 7, we get 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 98085.57142
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.

On to step 12:
7 can be fit into 60 8 times, resulting in a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 98085.571428
If we take 56 away from 60, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
The number 7 fits into 40 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 98085.5714285
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.

Advancing to step 14:
The number 7 fits into 50 7 times, leaving a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 98085.57142857
If we subtract 49 from 50, we 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.

Our division results in 98085.57142857 with a remaining 1e-09.