Add : 3m2n + 5mn2 - 7mn and 2m2n - mn2 + mn.
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Solution : (3m2n + 5mn2 - 7mn) + (2m2n - mn2 + mn)
= 3m2n + 5mn2 - 7mn + 2m2n - mn2 + mn
= 3m2n + 2m2n + 5mn2 - mn2 - 7mn + mn (Like terms are arranged.)
= 5m2n + 4mn2 - 6mn
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