Alright, ready to do some subtraction? We're taking 28608 and subtracting 8499 from it.

Step 1: We'll start by subtracting the digit 9 and the borrow 0 from 8 in column 1 and get -1.
We add -1 to 10 and get 9 as the first digit of the result.

Step 2: We'll start by subtracting the digit 9 and the borrow 1 from 0 in column 2 and get -10.
We add -10 to 10 and get 0 as the next digit of the result.

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

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

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

So, 28608 - 8499 = 20109.