We can solve this together! We're beginning with 868852884 and removing 136722320 from it.

Step 1: We'll start by subtracting the digit 0 and the borrow 0 from 4 in column 1 and get 4.
4 is the first digit of our result.

Step 2: We'll start by subtracting the digit 2 and the borrow 0 from 8 in column 2 and get 6.
6 is the next digit of our result.

Step 3: We'll start by subtracting the digit 3 and the borrow 0 from 8 in column 3 and get 5.
5 is the next digit of our result.

Step 4: We'll start by subtracting the digit 2 and the borrow 0 from 2 in column 4 and get 0.
0 is the next digit of our result.

Step 5: We'll start by subtracting the digit 2 and the borrow 0 from 5 in column 5 and get 3.
3 is the next digit of our result.

Step 6: We'll start by subtracting the digit 7 and the borrow 0 from 8 in column 6 and get 1.
1 is the next digit of our result.

Step 7: We'll start by subtracting the digit 6 and the borrow 0 from 8 in column 7 and get 2.
2 is the next digit of our result.

Step 8: We'll start by subtracting the digit 3 and the borrow 0 from 6 in column 8 and get 3.
3 is the next digit of our result.

Step 9: We'll start by subtracting the digit 1 and the borrow 0 from 8 in column 9 and get 7.
7 is the next digit of our result.

So, 868852884 - 136722320 = 732130564.