add;3p3q+2p2q+7;2p2q+4pq-(-2)p3q
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Step-by-step explanation:
( 3p^3q + 2p^2q + 7 ) + ( 2p^2q + 4pq -(-2)p^3q )
= ( 3 + 2 ) p^3q + (2+2)p^2q + 4pq + 7
= 5p^3q + 4p^2q + 4pq + 7
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