(2x+1)/3-(2x-1)/3-(x-1/6)=2
两边*6
2(2x+1)-2(2x-1)-(6x-1)=12
4x+2-4x+2-6x+1=12
4x-4x-6x=12-1-2-2
-6x=7
x=-7/6
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