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= (m + 4n) (m - 4n) / -2(m - 4n)
= -1/2 (m + 4n)
20. (1 - m²) / (m² + m - 2)
= (1 + m) (1 - m) / (m + 2) (m - 1)
= - (1 + m) (m - 1) / (m + 2) (m - 1)
= - (1 + m) / (m + 2)