129280 ÷ 86 
Our goal is to divide 129280 by 86.

Advancing to step 1:
86 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 86

Moving on to step 2:
When dividing 12 by 86, we get 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 86

Going ahead to step 3:
If we divide 129 by 86, we get 1 and a remainder of 43.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 43 after subtracting 86 from 129.
Take the next digit (2) from the dividend and append it to 43, then repeat: 432 / 86

On to step 4:
The number 86 fits into 432 5 times, leaving a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 430 away from 432, we end up with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 86

Step 5:
The number 86 fits into 28 0 times, leaving a remainder of 28.
Put 0 as the next digit of the answer. 
Result so far: 150.0
If we take 0 away from 28, we end up with 28.
Grab the next digit (0) from the dividend, add it to 28, then carry on: 280 / 86

Step 6:
86 can be fit into 280 3 times, resulting in a remainder of 22.
Record the quotient 3 as the next digit in the result. 
Result so far: 1503.0
If we subtract 258 from 280, we get 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 7:
If we divide 220 by 86, we get 2 and a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 1503.2
If we subtract 172 from 220, we 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.

Advancing to step 8:
86 can be fit into 480 5 times, resulting in a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 1503.25
Deduct 430 from 480 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
When dividing 500 by 86, we get 5 with a remainder of 70.
The number 5 becomes the next digit in our result. 
Result so far: 1503.255
If we subtract 430 from 500, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 1503.255, with a leftover of 0.007.