Which expressions are equivalent to 6 +(–x) + 2x + (–7) + 2x? Check all that apply.

Combine like terms in the original expression: −x + 2x + 2x = 3x, and 6 − 7 = −1, so it simplifies to 3x − 1. Choice A also simplifies to 3x − 1. In choice C, 3 − 4 = −1 and −x + 2x + 2x = 3x, so it is equivalent too.

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