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= 6x² - 2x - (x² - 2x + 3x - 6)
= 6x² - 2x - (x² + x - 6)
= 6x² - 2x - x² - x + 6
= 6x² - x² - 2x - x + 6
= 5x² - 3x + 6 (C)