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gof(x) = 2x - 3
g(f(x)) = 2x - 3
g(x + 4) = 2x - 3
g(t) = 2(t - 4) - 3
g(t) = 2t - 8 - 3
g(t) = 2t - 11
Jadi, g(x) = 2x - 11