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4xy - 2y(x + 4) = 4xy - 2xy - 8y = 2xy - 8y = 2y(x - 4)
2xy
4xy - 2xy
(2x2+4xy-3)-(x2-2xy-4)Answer: x2+6x+1
2y + 2xy' + 4y + 4xy' = 0 6y + 6xy' = 0 y' = -y/x