x+x - 2x, x+2x - 3x, x+x+4 - 2x+4, 5x + 2x + 3y + 4y + 2 - 7x+7y+2, 3*(x-2) - 3x-6, 5*(x+2y) - 5x + 10y, 9 * (x+4y + 3) - 9x + 36y + 27, 18x - (12x-4) - 6x + 4, 18x - (12x + 4) - 6x - 4, 18x + (12x + 4) - 30x + 4, 18x + (12x - 4) - 30x- 4, 7 * (x+2) - 7x + 14, 15x + 3*5 - 15x + 15, 15x + 3*5 - 1 - 15x + 14, 2x + 3x + 4x - 10x,

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