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= 3(4a + 5) - 2
= 12a + 15 - 2
= 12a + 13
f = (4a + 5)
maka, nilai f = (4a + 5) :
=> 3x - 2
=> 3(4a + 5) - 2
=> 12a + 15 - 2
=> 12a + 13
"maaf kalau ada yg salah"