Simplify by combining like terms

7b - (3a-8b)

-1b-3a I believe. You start by subtracting 8b from 7b, from which you would get - 1b. Then, since there are no other integers paired with the variable a, you just leave the expression as - 1b-3a. If you knew what the variables stood for, then you could simplify this expression further, but with the information provided, this is the simplest answer.