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Buatlah menjadi persamaan (f°g)(a), maka:
(f°g)(a) = 6
=> f[g(a)] = 6
=> f(1 - a) -> 2a - 3 = 6
=> f(1 - a) -> 2(1-a) - 3 = 6
=> 2(1 - a) = 9
=> 2 - 2a = 9
=> -2a = 7, maka a =
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