Got it! So, we have 868607431 and 384323389, and we'll subtract the latter from the former.

Step 1: We'll start by subtracting the digit 9 and the borrow 0 from 1 in column 1 and get -8.
We add -8 to 10 and get 2 as the first digit of the result.

Step 2: We'll start by subtracting the digit 8 and the borrow 1 from 3 in column 2 and get -6.
We add -6 to 10 and get 4 as the next digit of the result.

Step 3: We'll start by subtracting the digit 3 and the borrow 1 from 4 in column 3 and get 0.
0 is the next digit of our result.

Step 4: We'll start by subtracting the digit 3 and the borrow 0 from 7 in column 4 and get 4.
4 is the next digit of our result.

Step 5: We'll start by subtracting the digit 2 and the borrow 0 from 0 in column 5 and get -2.
We add -2 to 10 and get 8 as the next digit of the result.

Step 6: We'll start by subtracting the digit 3 and the borrow 1 from 6 in column 6 and get 2.
2 is the next digit of our result.

Step 7: We'll start by subtracting the digit 4 and the borrow 0 from 8 in column 7 and get 4.
4 is the next digit of our result.

Step 8: We'll start by subtracting the digit 8 and the borrow 0 from 6 in column 8 and get -2.
We add -2 to 10 and get 8 as the next digit of the result.

Step 9: We'll start by subtracting the digit 3 and the borrow 1 from 8 in column 9 and get 4.
4 is the next digit of our result.

So, 868607431 - 384323389 = 484284042.