f(x)=g(x)−1, g(x)=5x+2. Find f(4)−g(2)

PLZ ANSWER FAST
(you dont have to show work as long as the answer is right)

f(4)=(5(4))+2)-1=21

g(2)=((5*2))+2)=12
f(4)-g(2)=21-12=9 ☺☺☺☺