Final answer to the problem
$\left(m-n\right)\left(2m-m-n\right)$
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Step-by-step Solution
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1
Solve the product $-\left(m+n\right)$
$\left(m-n\right)\left(2m-m-n\right)$
Final answer to the problem
$\left(m-n\right)\left(2m-m-n\right)$