Alright, ready to do some subtraction? We're taking 7989 and subtracting 3841 from it.

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

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

Step 3: We'll start by subtracting the digit 8 and the borrow 0 from 9 in column 3 and get 1.
1 is the next digit of our result.

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

So, 7989 - 3841 = 4148.