$3 m n + (- 5 m n) =$

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Solution

$3 m n + (- 5 m n) = 3 m n - 5 m n$
$= (3 - 5) m n$
$= (- 2) m n$

Hence, $3 m n + (- 5 m n) = - 2 m n$ .

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