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= 7a + 7ab - 3b - 3ab
= 7a + 7ab - 3ab - 3b
=7a + 4ab - 3b
= 7a + 7ab - 3b + 3ab
= 7a +7ab + 3ab - 3b
= 7a + 10ab - 3b
semoga bener..
maaf kalo salah