jika f(x)=3x-1 dan f°g(x)=6x-1 maka g-¹(x) tolong bantu ya!!!

fog(x) = f(g(x))
6x-1 = 3(g(x))-1
6x-1+1 = 3(g(x))
6x = 3(g(x))
g(x) = 6x/3
g(x) = 3x
maka g-¹(x) = x/3