We can solve this together! We're beginning with 63721 and removing 15457 from it.

Step 1: We'll start by subtracting the digit 7 and the borrow 0 from 1 in column 1 and get -6.
We add -6 to 10 and get 4 as the first digit of the result.

Step 2: We'll start by subtracting the digit 5 and the borrow 1 from 2 in column 2 and get -4.
We add -4 to 10 and get 6 as the next digit of the result.

Step 3: We'll start by subtracting the digit 4 and the borrow 1 from 7 in column 3 and get 2.
2 is the next digit of our result.

Step 4: We'll start by subtracting the digit 5 and the borrow 0 from 3 in column 4 and get -2.
We add -2 to 10 and get 8 as the next digit of the result.

Step 5: We'll start by subtracting the digit 1 and the borrow 1 from 6 in column 5 and get 4.
4 is the next digit of our result.

So, 63721 - 15457 = 48264.