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= (-2p pangkat3 + 4pq - 2q pangkat 2) + ( 3p pangkat3 + 12pq - 3q pangkat2)
= -2p pangkat3 + 3p pangkat3 + 4pq + 12pq - 2q pangkat2 - 3q pangkat2
= p pangkat3 + 16pq - 5q pangkat 2