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= 2x + 5
maka
f (3) = 2 (3) + 5
= 6 + 5
= 11
misal a = 2x
x = 1/2 a
f(a) = 4 (1/2a) + 5
= 2a + 5
f(x) = 2x + 5
f(3) = 2.3 + 5
= 6 + 5
= 11
semoga membantu ya :)