We look at the division of 754090 by 86 
The aim is to understand the frequency of 86 in 754090.

Advancing to step 1:
86 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 86

On to step 2:
86 goes into 75 0 times with a remainder of 75.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 75, we get 75.
Take the next digit (4) from the dividend and append it to 75, then repeat: 754 / 86

Step 3:
If we divide 754 by 86, we get 8 and a remainder of 66.
The next digit of our result is 8. 
Result so far: 8.0
Subtract 688 from 754 to get 66.
Append the next digit (0) from the dividend to 66 and continue with: 660 / 86

Advancing to step 4:
When dividing 660 by 86, we get 7 with a remainder of 58.
The number 7 becomes the next digit in our result. 
Result so far: 87.0
If we subtract 602 from 660, we get 58.
Grab the next digit (9) from the dividend, add it to 58, then carry on: 589 / 86

Let's proceed to step 5:
The number 86 fits into 589 6 times, leaving a remainder of 73.
Use 6 as the next digit of our solution. 
Result so far: 876.0
The remainder is 73 after subtracting 516 from 589.
Append the next digit (0) from the dividend to 73 and continue with: 730 / 86

Going ahead to step 6:
86 goes into 730 8 times with a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 8768.0
Subtract 688 from 730 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 7:
When dividing 420 by 86, we get 4 with a remainder of 76.
The next digit of our result is 4. 
Result so far: 8768.4
The remainder is 76 after subtracting 344 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 8:
760 divided by 86 is 8 with a remainder of 72.
Use 8 as the next digit of our solution. 
Result so far: 8768.48
If we subtract 688 from 760, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 9:
86 goes into 720 8 times with a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 8768.488
If we take 688 away from 720, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 8768.488 and a remainder of 0.0032.