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f(x) = 2x
g(x) = 3-5x
(gof)⁻¹(x) --> kerjain gof dulu baru diinvers....
g(f(x))
g(2x) = 3-5x
= 3-10x
inversnya ya anggap aja
y = 3-10x
maka x = y+3/10 --> inversnya, ganti y jadi x = x+3/10