We look at the division of 351414 by 86 
The aim is to understand the frequency of 86 in 351414.

On to step 1:
86 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 86

On to step 2:
When dividing 35 by 86, we get 0 with a remainder of 35.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Bring next digit (1) of the dividend behind the 35 and repeat the process: 351 / 86

On to step 3:
If we divide 351 by 86, we get 4 and a remainder of 7.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 344 from 351 and we're left with 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 86

On to step 4:
When dividing 74 by 86, we get 0 with a remainder of 74.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Subtract 0 from 74 to get 74.
Fetch the next digit (1) from the dividend, attach it to 74 and continue: 741 / 86

On to step 5:
86 goes into 741 8 times with a remainder of 53.
Write down 8 as next digit of the result. 
Result so far: 408.0
Deduct 688 from 741 and we're left with 53.
Append the next digit (4) from the dividend to 53 and continue with: 534 / 86

On to step 6:
If we divide 534 by 86, we get 6 and a remainder of 18.
The next digit of our result is 6. 
Result so far: 4086.0
Deduct 516 from 534 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
If we divide 180 by 86, we get 2 and a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 4086.2
If we subtract 172 from 180, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
86 goes into 80 0 times with a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 4086.2
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 9:
86 can be fit into 800 9 times, resulting in a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 4086.209
Subtracting 774 from 800 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 10:
260 divided by 86 is 3 with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 4086.2093
If we subtract 258 from 260, we 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.

Moving on to step 11:
When dividing 20 by 86, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 4086.2093
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
The number 86 fits into 200 2 times, leaving a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 4086.209302
The remainder is 28 after subtracting 172 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 13:
86 can be fit into 280 3 times, resulting in a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 4086.2093023
Deduct 258 from 280 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 14:
If we divide 220 by 86, we get 2 and a remainder of 48.
The next digit of our result is 2. 
Result so far: 4086.20930232
Subtract 172 from 220 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.

The final outcome is 4086.20930232, with a leftover of 4.8e-08.