Let's get this math done. We have 771298893 and 448626103, and we're going to subtract the second number from the first.

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

Step 2: We'll start by subtracting the digit 0 and the borrow 0 from 9 in column 2 and get 9.
9 is the next digit of our result.

Step 3: We'll start by subtracting the digit 1 and the borrow 0 from 8 in column 3 and get 7.
7 is the next digit of our result.

Step 4: We'll start by subtracting the digit 6 and the borrow 0 from 8 in column 4 and get 2.
2 is the next digit of our result.

Step 5: We'll start by subtracting the digit 2 and the borrow 0 from 9 in column 5 and get 7.
7 is the next digit of our result.

Step 6: We'll start by subtracting the digit 6 and the borrow 0 from 2 in column 6 and get -4.
We add -4 to 10 and get 6 as the next digit of the result.

Step 7: We'll start by subtracting the digit 8 and the borrow 1 from 1 in column 7 and get -8.
We add -8 to 10 and get 2 as the next digit of the result.

Step 8: We'll start by subtracting the digit 4 and the borrow 1 from 7 in column 8 and get 2.
2 is the next digit of our result.

Step 9: We'll start by subtracting the digit 4 and the borrow 0 from 7 in column 9 and get 3.
3 is the next digit of our result.

So, 771298893 - 448626103 = 322672790.