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Add (-x^2-2x+6)+(-9x^2-7x+6)
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Add (-x^2-2x+6)+(-9x^2-7x+6)

User Abahet
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(-x²-2x+6)+(-9x²-7x+6) = -x²-2x+6-9x²-7x+6 = -10x² - 9x + 12

User Hhrzc
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