5m 3 -1 -m 2 +5m - (5m-1)(m 2 +1), 8xy+4x+1+2y - (4x+1)(2y+1), 1+m+4mn+4n - (m+1)(4n+1), 5xy 3 - 15xyz - y 2 +3z  - (y 2 -3z)(5xy-1),

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