Got it! So, we have 810119020 and 279763709, and we'll subtract the latter from the former.

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

Step 2: We'll start by subtracting the digit 0 and the borrow 1 from 2 in column 2 and get 1.
1 is the next digit of our result.

Step 3: We'll start by subtracting the digit 7 and the borrow 0 from 0 in column 3 and get -7.
We add -7 to 10 and get 3 as the next digit of the result.

Step 4: We'll start by subtracting the digit 3 and the borrow 1 from 9 in column 4 and get 5.
5 is the next digit of our result.

Step 5: We'll start by subtracting the digit 6 and the borrow 0 from 1 in column 5 and get -5.
We add -5 to 10 and get 5 as the next digit of the result.

Step 6: We'll start by subtracting the digit 7 and the borrow 1 from 1 in column 6 and get -7.
We add -7 to 10 and get 3 as the next digit of the result.

Step 7: We'll start by subtracting the digit 9 and the borrow 1 from 0 in column 7 and get -10.
We add -10 to 10 and get 0 as the next digit of the result.

Step 8: We'll start by subtracting the digit 7 and the borrow 1 from 1 in column 8 and get -7.
We add -7 to 10 and get 3 as the next digit of the result.

Step 9: We'll start by subtracting the digit 2 and the borrow 1 from 8 in column 9 and get 5.
5 is the next digit of our result.

So, 810119020 - 279763709 = 530355311.