Add 3x 2–4x + 7 + –5x2+ 6x + 9.
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3x² - 4x + 7 + (- 5x² + 6x + 9)
3x² - 4x + 7 - 5x² + 6x + 9
3x² - 5x² - 4x + 6x + 7 + 9
- 2x² + 2x + 16
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