Can someone please help me

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25 votes

Answer:

-m + 7n - 2

Explanation:

$(-2m-3n-1)+(5m+3n+4)+(-4m+7n-5)=\\-2m-3n-1+5m+3n+4-4m+7n-5=\\-2m+5m-4m-3n+3n+7n-1+4-5=\\-m+7n-2$

Sogl answered Sep 20, 2022

by Sogl

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