73158313 ÷ 129 
We want to figure out the number of times 73158313 can be divided by 129.

Step 1:
If we divide 7 by 129, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 129

Moving on to step 2:
129 goes into 73 0 times with a remainder of 73.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 73 to get 73.
Append the next digit (1) from the dividend to 73 and continue with: 731 / 129

Step 3:
129 goes into 731 5 times with a remainder of 86.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 645 away from 731, we end up with 86.
Bring next digit (5) of the dividend behind the 86 and repeat the process: 865 / 129

Moving on to step 4:
The number 129 fits into 865 6 times, leaving a remainder of 91.
The number 6 becomes the next digit in our result. 
Result so far: 56.0
Subtracting 774 from 865 leaves us with 91.
Fetch the next digit (8) from the dividend, attach it to 91 and continue: 918 / 129

Moving on to step 5:
129 goes into 918 7 times with a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 567.0
Subtracting 903 from 918 leaves us with 15.
Take the next digit (3) from the dividend and append it to 15, then repeat: 153 / 129

Moving on to step 6:
If we divide 153 by 129, we get 1 and a remainder of 24.
Record the quotient 1 as the next digit in the result. 
Result so far: 5671.0
If we take 129 away from 153, we end up with 24.
Include the next digit (1) from the dividend after 24, then repeat: 241 / 129

On to step 7:
129 can be fit into 241 1 times, resulting in a remainder of 112.
Use 1 as the next digit of our solution. 
Result so far: 56711.0
The remainder is 112 after subtracting 129 from 241.
Include the next digit (3) from the dividend after 112, then repeat: 1123 / 129

Advancing to step 8:
The number 129 fits into 1123 8 times, leaving a remainder of 91.
Use 8 as the next digit of our solution. 
Result so far: 567118.0
Subtracting 1032 from 1123 leaves us with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Advancing to step 9:
910 divided by 129 is 7 with a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 567118.7
If we take 903 away from 910, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 10:
129 goes into 70 0 times with a remainder of 70.
The next digit of our result is 0. 
Result so far: 567118.7
If we subtract 0 from 70, 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.

Let's proceed to step 11:
129 can be fit into 700 5 times, resulting in a remainder of 55.
The next digit of our result is 5. 
Result so far: 567118.705
If we subtract 645 from 700, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 12:
129 goes into 550 4 times with a remainder of 34.
The next digit of our result is 4. 
Result so far: 567118.7054
If we take 516 away from 550, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 13:
129 can be fit into 340 2 times, resulting in a remainder of 82.
The number 2 becomes the next digit in our result. 
Result so far: 567118.70542
Subtract 258 from 340 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 14:
When dividing 820 by 129, we get 6 with a remainder of 46.
Use 6 as the next digit of our solution. 
Result so far: 567118.705426
If we take 774 away from 820, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 15:
The number 129 fits into 460 3 times, leaving a remainder of 73.
Record the quotient 3 as the next digit in the result. 
Result so far: 567118.7054263
Subtract 387 from 460 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 16:
If we divide 730 by 129, we get 5 and a remainder of 85.
Put 5 as the next digit of the answer. 
Result so far: 567118.70542635
The remainder is 85 after subtracting 645 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

The final outcome is 567118.70542635, with a leftover of 8.5e-08.