A + B + C = (3x2 + 2x - 4) + (-6x2 - 12) + (12x2 - 9x - 4)
= (12-6-3)x2 + (2-9)x + (-4-12-4)
= 3x2 -7x -20
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A + B + C = (3x2 + 2x - 4) + (-6x2 - 12) + (12x2 - 9x - 4)
= (12-6-3)x2 + (2-9)x + (-4-12-4)
= 3x2 -7x -20