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(gof)(x) = 2x + 6
⇔ g (x-1) = 2x + 6
misal : x-1 = a ⇔ x = a + 1
g(a) = 2(a+1) + 6
= 2a + 2 + 6
=2a + 8
g(x) = 2x + 8