7a2b2 - a2b2, 6b2 - 1,5b2, 4b - 9b, 3ab2d - 2ab2d, 2x2 - -x2, 7xy2 - 3xy2, 3x2y - 2x2y, 7y3 - 2y3, 7y - 4y, 3m2 - 5m2, 6cm3 - -9,5cm3,

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