If $f(x)=5 x$ and $g(x)=3 x-6$, find $(f g)(x)$.
\[
(\mathrm{fg})(\mathrm{x})=\square
\]
\(\boxed{f(g(x)) = 15x - 30}\)
Step 1 :\(f(g(x)) = f(3x - 6)\)
Step 2 :\(f(g(x)) = 5(3x - 6)\)
Step 3 :\(f(g(x)) = 15x - 30\)
Step 4 :\(\boxed{f(g(x)) = 15x - 30}\)