Add 7pq + 5qr - 3rp, 4qr + 9rp -- 4q, -3pr+ 5p - pq
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Step-by-step explanation:
7pq + 5qr - 3rp +4qr +9rp -4q + (-3pr) +5p -pq
6pq +9qr +3rp -4q +5p
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