Subtract 15 m n minus 22 m plus 2 n from 14 m n minus 12 m plus 7 n

Subtract the first expression by changing each of its signs: (14mn − 12m + 7n) − (15mn − 22m + 2n) = 14mn − 12m + 7n − 15mn + 22m − 2n. Combine like terms to get −mn + 10m + 5n, which is choice B.

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