4x³-5x²+2x-6 and 3x-x²-x³+4
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4x³ - 5x² + 2x - 6 + 3x - x² - x³ + 4
4x³ - x³ - 5x² - x² + 2x + 3x - 6 + 4
3x³ - 6x² + 5x - 2
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