m + n - mn + nm -mn² + 12m - 17 + 3n + 8
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[tex]m + n - mn + nm - {mn}^{2} + 12m - 17 + 3n + 8 \\ = (m + 12m) + (n + 3n) - mn + nm - {mn}^{2} - (17 + 8) \\ = 13m + 4n - mn + nm - {mn}^{2} - 25[/tex]
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