Let's dive into this subtraction. We'll start with 66919379 and subtract 13266212 from it.

Step 1: We'll start by subtracting the digit 2 and the borrow 0 from 9 in column 1 and get 7.
7 is the first digit of our result.

Step 2: We'll start by subtracting the digit 1 and the borrow 0 from 7 in column 2 and get 6.
6 is the next digit of our result.

Step 3: We'll start by subtracting the digit 2 and the borrow 0 from 3 in column 3 and get 1.
1 is the next digit of our result.

Step 4: We'll start by subtracting the digit 6 and the borrow 0 from 9 in column 4 and get 3.
3 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 2 and the borrow 1 from 9 in column 6 and get 6.
6 is the next digit of our result.

Step 7: We'll start by subtracting the digit 3 and the borrow 0 from 6 in column 7 and get 3.
3 is the next digit of our result.

Step 8: We'll start by subtracting the digit 1 and the borrow 0 from 6 in column 8 and get 5.
5 is the next digit of our result.

So, 66919379 - 13266212 = 53653167.