a+a+a - 3a, a x a x a - a3, a +b +2b -3a - 3b -2a, 2a+3b -4a -b - 2b -2a, 2p2 +3p2 - 5p2, 2 x 3p2 - 6p2, 2x+5y-x - x+5y, x + 7y +x - 4y - 2x +3y, 3x + y - x +3y - 2x +4y, 2x2 + 4x2 +x2 - 7x2, 2a x 3b x 2c - 12abc, 2a x 4b - 8ab, 2a x 6cd - 12acd, 3ab x 4d - 12abd, 2ab x 3a2 - 6a3b, 4a2b x 2ab3 - 8a3b4,

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