(-4pq + 2pr + 5pqr + 1) - (3pq + 5qr - 7pr + 1)
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Answer:
(-4pq + 2pr + 5pqr + 1) -(3pq+5qr-7pr + 1)
= -4pq-3pq+2pr+7pr+5pqr-5qr+1-1
= -7pq + 9pr + 5pqr - 5qr
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