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OpenStudy (anonymous):
simplify -4x2-9+3x+6x2-7x
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OpenStudy (lalaly):
\[-4x^2-9+3x+6x^2-7x = 2x^2-4x-9\]
OpenStudy (anonymous):
\[-4x^{2}-9+3x+6x^{2}-7x\]\[6x^{2}-4x^{2}+3x-7x-9\]\[2x^{2}-4x-9\]
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