We're dividing 57515 by 86 
We want to figure out the number of times 57515 can be divided by 86.

Moving on to step 1:
If we divide 5 by 86, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 86

On to step 2:
If we divide 57 by 86, we get 0 and a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 57 after subtracting 0 from 57.
Append the next digit (5) from the dividend to 57 and continue with: 575 / 86

On to step 3:
575 divided by 86 is 6 with a remainder of 59.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 516 away from 575, we end up with 59.
Include the next digit (1) from the dividend after 59, then repeat: 591 / 86

Going ahead to step 4:
When dividing 591 by 86, we get 6 with a remainder of 75.
Write down 6 as next digit of the result. 
Result so far: 66.0
If we take 516 away from 591, we end up with 75.
Grab the next digit (5) from the dividend, add it to 75, then carry on: 755 / 86

Going ahead to step 5:
The number 86 fits into 755 8 times, leaving a remainder of 67.
Record the quotient 8 as the next digit in the result. 
Result so far: 668.0
If we take 688 away from 755, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 6:
If we divide 670 by 86, we get 7 and a remainder of 68.
The number 7 becomes the next digit in our result. 
Result so far: 668.7
Deduct 602 from 670 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 7:
The number 86 fits into 680 7 times, leaving a remainder of 78.
Record the quotient 7 as the next digit in the result. 
Result so far: 668.77
Deduct 602 from 680 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

The final result is 668.77 with a remainder of 0.078.