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3a(3a+4)4(3a+4)
3a(3a)3a(4)4(3a)4(4)
9a2+12a+12a+16
9a2+24a+16
= 3a + 4 + 3a + 4
= 3a + 3a + 4 + 4
=6a + 8
maap kalo salah