3p2q2 - 4pq + 5 + (-10p2q2) + 15 + 9pq + 7p2q2
= 3p2q2 + 7p2q2 - 10p2q2 + 9pq - 4pq + 5 + 15
= 10p2q2 - 10p2q2 + 5pq + 20
= 5pq + 20
-Answered by Nishant Verma On 17 October 2019:02:37:38 PM
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