OK, let's do this. We've got 800303470 and 766799539, and we're subtracting the second number from the first.

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 3 and the borrow 1 from 7 in column 2 and get 3.
3 is the next digit of our result.

Step 3: We'll start by subtracting the digit 5 and the borrow 0 from 4 in column 3 and get -1.
We add -1 to 10 and get 9 as the next digit of the result.

Step 4: We'll start by subtracting the digit 9 and the borrow 1 from 3 in column 4 and get -7.
We add -7 to 10 and get 3 as the next digit of the result.

Step 5: We'll start by subtracting the digit 9 and the borrow 1 from 0 in column 5 and get -10.
We add -10 to 10 and get 0 as the next digit of the result.

Step 6: We'll start by subtracting the digit 7 and the borrow 1 from 3 in column 6 and get -5.
We add -5 to 10 and get 5 as the next digit of the result.

Step 7: We'll start by subtracting the digit 6 and the borrow 1 from 0 in column 7 and get -7.
We add -7 to 10 and get 3 as the next digit of the result.

Step 8: We'll start by subtracting the digit 6 and the borrow 1 from 0 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 7 and the borrow 1 from 8 in column 9 and get 0.
0 is the next digit of our result.

So, 800303470 - 766799539 = 33503931.