5m - 7n, 3n - 4m + 2, 2m - 3mn - 5
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=5m - 7n + 3n - 4m + 2 + 2m - 3mn - 5
Bringing like terms alongside
=5m - 4m + 2m - 7n + 3n + 2 - 5 - 3mn
=3m - 4n - 3 - 3mn
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