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Which of the following equals (x + y + z) – (-2x +2y + z)?

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Question:

A
3x – y

explanation

Distribute the negative sign. Then identify, group, and combine like terms:

(x + y + z) − (−2x + 2y + z)

= x + y + z + 2x − 2y − z

= x + 2x + y − 2y + z − z

= 3x − y

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