11x - 8x + 3x, 10xy - 8xy + 2xy, 10x - 2x + 5x + 3x, 20a2 + 2a - 20a2 + 2a, 4x4 - -3x4 + 7x4, 5x2+5x - (2x2 + 4x) + (3x2 + x), 3x2+12x+4 - (x2 + 9x) + (2x2 + 3x+4), 8y-3 - (3y + 2) + (5y -6),

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