Okay, let's tackle this math problem. We're starting with 9545 and subtracting 2704.

Step 1: We'll start by subtracting the digit 4 and the borrow 0 from 5 in column 1 and get 1.
1 is the first digit of our result.

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

Step 3: We'll start by subtracting the digit 7 and the borrow 0 from 5 in column 3 and get -2.
We add -2 to 10 and get 8 as the next digit of the result.

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

So, 9545 - 2704 = 6841.