7p^2q - 8pq^2 - 3p^2q + 3pq^2
= (7p^2q - 3p^2q) - (8pq^2 + 3pq^2)
= 4p^2q - 5pq^2
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7p^2q - 8pq^2 - 3p^2q + 3pq^2
= (7p^2q - 3p^2q) - (8pq^2 + 3pq^2)
= 4p^2q - 5pq^2