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(=) x2 + 3x2 - x - xy - 6
(=) 4x2 - x - xy - 6
2. -2(p3 - 2pq + q2) + 3 (p3 + 4pq - q2)
(=) -2p3 - 4pq - 2q2 + 3p3 + 12pq - 3q2
(=) -2p3 + 3p3 - 2q2 - 3q2 - 4pq + 12pq
(=) p3 - 5q2 - 8pq