b) Subtract (3pq + 5pr - 7pr +1) from (-4pq +2pr - 2pr - 5pqr+1)
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(-4pq+2pr-2pr-5pqr+1)-(3pq+5pr-7pr+1)
=-4pq+2pr-2pr-5pqr+1-3pq-5pr+7pr-1
=-7pq+2pr+10pqr
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