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1 answer:
Answer:
![\sf 3\left[-x+\left(2x+1\right)\right]=x-1](https://tex.z-dn.net/?f=%5Csf%203%5Cleft%5B-x%2B%5Cleft%282x%2B1%5Cright%29%5Cright%5D%3Dx-1)

Combine like terms:


Expand:

Subtract 3 from both sides:


Subtract x from both sides:


Divide both sides by 2:


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