Add the following expressions:
$8 m n, - 3 m n, - 2 m n, 5 m n$ .

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Solution

If we add the expressions $8 m n, - 3 m n, - 2 m n, 5 m n$ then we get,
$8 m n - 3 m n - 2 m n + 5 m n$
$= 13 m n - 5 m n$
$= 8 m n$ .

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