Question 671526
{{{(3m^2n + 8mn - 4n) + (7mn - 6m^2n - 5) + (8 - 5n)}}}
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{{{3m^2n - 6m^2n + 8mn + 7mn - 4n - 5n - 5 + 8}}}
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{{{highlight(-3m^2n + 15mn - 9n + 3)}}}
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