Question

se g(x)=9-3x e g(f(x))=12-2x determine f(x)

Answer 1

9-3(f(x))=12-2x
-3(f(x))=12-2x-9
-3(f(x))=3-2x
f(x)=(3-2x)/(-3)
f(x)=(2x-3)/3