2m + m² + 2n - n² = (2m + 2n) + (m² - n²) = 2(m + n) + (m + n)(m - n) =
= (m + n)(2 + m - n)
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2m + m² + 2n - n² = (2m + 2n) + (m² - n²) = 2(m + n) + (m + n)(m - n) =
= (m + n)(2 + m - n)