We look at the division of 708447 by 86 
The aim is to understand the frequency of 86 in 708447.

On to step 1:
When dividing 7 by 86, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 86

On to step 2:
70 divided by 86 is 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 70, we get 70.
Take the next digit (8) from the dividend and append it to 70, then repeat: 708 / 86

Step 3:
The number 86 fits into 708 8 times, leaving a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 688 from 708 to get 20.
Append the next digit (4) from the dividend to 20 and continue with: 204 / 86

Let's proceed to step 4:
204 divided by 86 is 2 with a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 82.0
Subtracting 172 from 204 leaves us with 32.
Bring next digit (4) of the dividend behind the 32 and repeat the process: 324 / 86

Moving on to step 5:
If we divide 324 by 86, we get 3 and a remainder of 66.
The number 3 becomes the next digit in our result. 
Result so far: 823.0
If we take 258 away from 324, we end up with 66.
Append the next digit (7) from the dividend to 66 and continue with: 667 / 86

On to step 6:
86 can be fit into 667 7 times, resulting in a remainder of 65.
The number 7 becomes the next digit in our result. 
Result so far: 8237.0
Subtracting 602 from 667 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 7:
86 goes into 650 7 times with a remainder of 48.
Write down 7 as next digit of the result. 
Result so far: 8237.7
Subtract 602 from 650 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 8:
When dividing 480 by 86, we get 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 8237.75
If we subtract 430 from 480, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 9:
The number 86 fits into 500 5 times, leaving a remainder of 70.
The next digit of our result is 5. 
Result so far: 8237.755
Deduct 430 from 500 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

After the division, we end up with 8237.755 and a remainder of 0.007.