Jika (gof)(x)=1/2x-1 dan g(x)=2x-1 maka rumus f(x) adalah...

(g•f) (x) = 1/2×-1 & g(x) = 2x-1
f(×) = ?
g•f x = 1/2x-1
2f(x)-1 = 1/2x-1
f(x) = 1/2x-1+1
_______
2
f(x) = 0/2
f(X) = 0