86880723 divided by 129 
The aim is to understand the frequency of 129 in 86880723.

Advancing to step 1:
8 divided by 129 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 129

Moving on to step 2:
86 divided by 129 is 0 with a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Take the next digit (8) from the dividend and append it to 86, then repeat: 868 / 129

Let's proceed to step 3:
When dividing 868 by 129, we get 6 with a remainder of 94.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 774 from 868 and we're left with 94.
Append the next digit (8) from the dividend to 94 and continue with: 948 / 129

Moving on to step 4:
129 can be fit into 948 7 times, resulting in a remainder of 45.
Put 7 as the next digit of the answer. 
Result so far: 67.0
Deduct 903 from 948 and we're left with 45.
Take the next digit (0) from the dividend and append it to 45, then repeat: 450 / 129

On to step 5:
The number 129 fits into 450 3 times, leaving a remainder of 63.
The next digit of our result is 3. 
Result so far: 673.0
If we subtract 387 from 450, we get 63.
Take the next digit (7) from the dividend and append it to 63, then repeat: 637 / 129

Going ahead to step 6:
When dividing 637 by 129, we get 4 with a remainder of 121.
Use 4 as the next digit of our solution. 
Result so far: 6734.0
If we subtract 516 from 637, we get 121.
Grab the next digit (2) from the dividend, add it to 121, then carry on: 1212 / 129

Moving on to step 7:
If we divide 1212 by 129, we get 9 and a remainder of 51.
The number 9 becomes the next digit in our result. 
Result so far: 67349.0
If we take 1161 away from 1212, we end up with 51.
Include the next digit (3) from the dividend after 51, then repeat: 513 / 129

Advancing to step 8:
If we divide 513 by 129, we get 3 and a remainder of 126.
Use 3 as the next digit of our solution. 
Result so far: 673493.0
Deduct 387 from 513 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Going ahead to step 9:
If we divide 1260 by 129, we get 9 and a remainder of 99.
Put 9 as the next digit of the answer. 
Result so far: 673493.9
Deduct 1161 from 1260 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Step 10:
129 goes into 990 7 times with a remainder of 87.
Use 7 as the next digit of our solution. 
Result so far: 673493.97
Deduct 903 from 990 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Moving on to step 11:
129 goes into 870 6 times with a remainder of 96.
Put 6 as the next digit of the answer. 
Result so far: 673493.976
Subtracting 774 from 870 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 12:
When dividing 960 by 129, we get 7 with a remainder of 57.
Record the quotient 7 as the next digit in the result. 
Result so far: 673493.9767
Subtract 903 from 960 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 13:
570 divided by 129 is 4 with a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 673493.97674
If we subtract 516 from 570, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 14:
129 can be fit into 540 4 times, resulting in a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 673493.976744
If we take 516 away from 540, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

In conclusion, the division gives 673493.976744 with a balance of 2.4e-06.