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g(x) = 4x - 5
(gof)(x) = g(f(x)) = 4(x + 3) - 5 = 4x + 12 - 5 = 4x + 7
(gof)(x) = 4x + 7
misal (gof)(x) = y
y = 4x + 7
y - 7 = 4x