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2x^2 + 5x - 1 + 8x + x^2 + 7 - 6x + 3 - ...

`2x^2 + 5x - 1 + 8x + x^2 + 7 - 6x + 3 - 3x^2` = ___

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The correct Answer is:
`7x + 9`
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