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f(2a + 1) = 5(2a + 1) - 9
= 10a + 5 - 9
= 10a - 4
x = 2a + 1
jadi f(2a+1) = 5(2a+1)-9
= 10a + 5 - 9
= 10a - 4
semoga bermanfaat :)