18-3p-11q+5pq-pq
18 - 3p - 11q + 5pq - 2p { q}^{2} + 5 {p}^{2} q - 4 {q}^{2}q - 3pq + 5p {q}^{2} - 8p + 7q - 2018−3p−11q+5pq−2pq
2
+5p
2
q−4q
2
q−3pq+5pq
2
−8p+7q−20
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