AoPS Wiki talk:Problem of the Day/June 5, 2011

Problem

First, let's simply the expression $f(g(7+-3)+3)$ . We have $f(g(7+-3)+3) = f(g(4)+3).$ We know that $g(x)=4x-6$ .

That implies that $g(4)=4(4)-6=10$ . Now we know that $f(g(7+-3)+3) = f(g(4)+3) = f(10+3) = f(13) = \frac{13}{2} - \frac{5}{2} = \boxed{4}$ .