x-x-1
![x - x - 1 | \div 2 = 1 - x - 2 \div 3 x - x - 1 | \div 2 = 1 - x - 2 \div 3](https://tex.z-dn.net/?f=x+-+x+-+1+%7C+%5Cdiv+2+%3D+1+-+x+-+2+%5Cdiv+3)
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See the attachment which I attached.
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![](https://hi-static.z-dn.net/files/d3e/bf93b17b61cb6e904e18a791f0a90789.jpg)
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