No problem, let's work through this together. We're starting with 617458831 and are subtracting 189725154 from it.

Step 1: We'll start by subtracting the digit 4 and the borrow 0 from 1 in column 1 and get -3.
We add -3 to 10 and get 7 as the first digit of the result.

Step 2: We'll start by subtracting the digit 5 and the borrow 1 from 3 in column 2 and get -3.
We add -3 to 10 and get 7 as the next digit of the result.

Step 3: We'll start by subtracting the digit 1 and the borrow 1 from 8 in column 3 and get 6.
6 is the next digit of our result.

Step 4: We'll start by subtracting the digit 5 and the borrow 0 from 8 in column 4 and get 3.
3 is the next digit of our result.

Step 5: We'll start by subtracting the digit 2 and the borrow 0 from 5 in column 5 and get 3.
3 is the next digit of our result.

Step 6: We'll start by subtracting the digit 7 and the borrow 0 from 4 in column 6 and get -3.
We add -3 to 10 and get 7 as the next digit of the result.

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

Step 8: We'll start by subtracting the digit 8 and the borrow 1 from 1 in column 8 and get -8.
We add -8 to 10 and get 2 as the next digit of the result.

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

So, 617458831 - 189725154 = 427733677.