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= 5x² + 2x² + 1x - 3x - 6 - 7
= 7x² - 2x - 13
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= 5x² + x - 6 + 2x² - 3x - 7
= 5x² + 2x² + x - 3x - 6 - 7
= 7x² - 2x - 13