add
18pq+(-15pq)+3pq
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Answer:
18pq+(-15pq)+3pq=18pq-15pq+3pq
=3pq+3pq=6pq
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18pq+(-15pq)+3pq
=18pq-15pq+3pq
=18pq+3pq-15pq
=21pq-15pq
=6pq
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