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5m + 10n - 6m + 12n
5m - 6m + 10n + 12n
= - m + 22n
2. 3p( q - p ) + q( p - 5 )
3pq - 3p^2 + pq - 5q
3pq + pq - 3p^2 - 5q
4pq - 3p^2 - 5q
= - 3p^2 + 4pq - 5q