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2x³ - x² + x - 6x² + 3x - 3
2x³ - x² - 6x² + x + 3x -3
2x³ - 7x² + 4x² - 3
= 2x^3 - x^2 + x - 6x^2 + 3x -3
= 2x^3 - 7x^2 + 4x - 3