Subtract 7p-4pq+9q+12 from 15p+5pq-8q-6
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15p+ 5pq - 8q -6 - ( 7p - 4pq +9q + 12)
15p + 5pq - 8q - 6 - 7p +4pq - 9q - 12
15p - 7p + 5pq + 4pq - 8q - 9q -6 - 12
8p + 9pq - 17q - 18
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