1) 3X-2(X+1)=6X
X-2=6X
5X=-2
X=-0.4
2) X-3=3
X=6
3) 2(X+1)-12=X-1-2
2X+2-12=X-3
X=12-3-2=7
（x/2）-（x+1/3）=x（x-3/3）=1（x+1/2）-3=（x-1/4）-1/2
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