You can solve this buy looking at the terms of this expression. A term is seperated by a "+" or "-" sign. Here, we have 3 terms ("24/2," "6," and "8/2"). What we should do now is simplify each term and then combine them using the proper signs.
24/2=12
6
8/2=4
24/2-6+8/2=12-6+4=6+4=10
Using the math above, we can see that the solution to this expression is 10.