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(5m 3 + 3mn 2) + (-7m 2 n + mn 2 - n 3) - (mn 2 + 2m 3)
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(5m 3 + 3mn 2) + (-7m 2 n + mn 2 - n 3) - (mn 2 + 2m 3)

User Steven Schoen
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7m^3+5mn^3-n^3-7m^2


this is your answer
User Jose Sosa
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