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= 5a3b - 10a2b2 - 5ab3 -3a3b + 3a2b2 - 3ab3
= 5a3b - 3a3b - 10a2b2 + 3a2b2 -5ab3 - 3ab3
= 2a3b - 7a2b2 - 8ab3
jadi jawabannya adalah c dan d