6p²q-5pq+7pq²-10p+9q from 20-5p-13q+7pq-4pq²+7p²q
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= 6p²q-5pq+7pq²-10p+9q-20-5p-13q+7pq-4pq²+7p²q
=6p²q+7p²q-5pq+7pq-4pq²+7pq²-10p-5p-13q+9q-20
=13p²q+2pq+3pq²-15p-6q-20
____
Hence solved ✓
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