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SIMPLIFY THE EXPRESSION-14m+2m -7m +4n - 9-5n -2

User Yuly
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\begin{gathered} -14m+2m-7m+4n-9-5n-2 \\ -14m+2m-7m+4n-5n-9-2 \\ -19m-n-11 \end{gathered}

User Vidal Quevedo
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