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6x - 5y -2z + (-8x + 6y + 9z) = 6x - 8x - 5y + 6y - 2z + 9z = -2x + y + 7z
3 (2X² - 4x + 5) + 2(4X² + 3x -7) = 6X² - 8x + 15 + 8X² + 6X - 14 = 14X² - 2X + 1