We look at the division of 77142803 by 129 
Let's see how many times 129 fits into 77142803.

Advancing to step 1:
129 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 129

Step 2:
When dividing 77 by 129, we get 0 with a remainder of 77.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 77 after subtracting 0 from 77.
Append the next digit (1) from the dividend to 77 and continue with: 771 / 129

On to step 3:
771 divided by 129 is 5 with a remainder of 126.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 126 after subtracting 645 from 771.
Grab the next digit (4) from the dividend, add it to 126, then carry on: 1264 / 129

Let's proceed to step 4:
When dividing 1264 by 129, we get 9 with a remainder of 103.
The number 9 becomes the next digit in our result. 
Result so far: 59.0
Subtract 1161 from 1264 to get 103.
Take the next digit (2) from the dividend and append it to 103, then repeat: 1032 / 129

Let's proceed to step 5:
The number 129 fits into 1032 8 times, leaving a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 598.0
Subtracting 1032 from 1032 leaves us with 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 129

Advancing to step 6:
If we divide 8 by 129, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 5980.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 129

Advancing to step 7:
When dividing 80 by 129, we get 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 59800.0
Subtracting 0 from 80 leaves us with 80.
Fetch the next digit (3) from the dividend, attach it to 80 and continue: 803 / 129

Advancing to step 8:
The number 129 fits into 803 6 times, leaving a remainder of 29.
Write down 6 as next digit of the result. 
Result so far: 598006.0
Subtract 774 from 803 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 9:
129 can be fit into 290 2 times, resulting in a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 598006.2
Deduct 258 from 290 and we're left 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.

Advancing to step 10:
129 goes into 320 2 times with a remainder of 62.
Write down 2 as next digit of the result. 
Result so far: 598006.22
Deduct 258 from 320 and we're left 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.

The final result is 598006.22 with a remainder of 0.062.