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f(3a + 5) = 2(3a + 5) - 4
f(3a + 5) = 6a + 10 - 4
f(3a + 5) = 6a + 6
atau
f(3a + 5) = 6(a + 1)
f(3a+5) = 2(3a+5) - 4
= 6a + 10 - 4
= 6a +6