3ab2 - ab2, -2ab - 4ab, 0,5a2b - 5a2b, a2b2 - 7a2b2, -3a2 - a2, 1,5b2 - 6b2, -2a - 7a, 9b - 4b, -abd - 6abd, 2ab2d - 3ab2d, -2x - x, 4xy - xy , -x2 - 2x2, 3xy2 - 7xy2, 2x2y - 3x2y, 2y3 - 7y3, 3y2 - 2y2, 4y - 7y, 5m2 - 3m2, -9,5cm3 - 6cm3,

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