We're dividing 209529 by 86 
The aim is to understand the frequency of 86 in 209529.

Advancing to step 1:
When dividing 2 by 86, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 86

Going ahead to step 2:
If we divide 20 by 86, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 86

On to step 3:
86 goes into 209 2 times with a remainder of 37.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 172 away from 209, we end up with 37.
Fetch the next digit (5) from the dividend, attach it to 37 and continue: 375 / 86

Moving on to step 4:
86 can be fit into 375 4 times, resulting in a remainder of 31.
The next digit of our result is 4. 
Result so far: 24.0
If we take 344 away from 375, we end up with 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 86

Step 5:
When dividing 312 by 86, we get 3 with a remainder of 54.
Record the quotient 3 as the next digit in the result. 
Result so far: 243.0
The remainder is 54 after subtracting 258 from 312.
Include the next digit (9) from the dividend after 54, then repeat: 549 / 86

Advancing to step 6:
86 can be fit into 549 6 times, resulting in a remainder of 33.
Write down 6 as next digit of the result. 
Result so far: 2436.0
Subtract 516 from 549 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 7:
The number 86 fits into 330 3 times, leaving a remainder of 72.
The next digit of our result is 3. 
Result so far: 2436.3
The remainder is 72 after subtracting 258 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 8:
86 can be fit into 720 8 times, resulting in a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 2436.38
If we subtract 688 from 720, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 9:
The number 86 fits into 320 3 times, leaving a remainder of 62.
The number 3 becomes the next digit in our result. 
Result so far: 2436.383
If we take 258 away from 320, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 10:
If we divide 620 by 86, we get 7 and a remainder of 18.
The next digit of our result is 7. 
Result so far: 2436.3837
Subtract 602 from 620 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 11:
If we divide 180 by 86, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 2436.38372
The remainder is 8 after subtracting 172 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 12:
86 goes into 80 0 times with a remainder of 80.
The next digit of our result is 0. 
Result so far: 2436.38372
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 13:
800 divided by 86 is 9 with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 2436.3837209
Subtract 774 from 800 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 14:
260 divided by 86 is 3 with a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 2436.38372093
The remainder is 2 after subtracting 258 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 2436.38372093, with a leftover of 2e-09.