x+x-1/2=3
等式两边同乘2
2x+x-1=6
3x=7
x=7/3
x+x-1/2=3x-1/2
2x-1/2=3x-1/2
2x-3x=-1/2+1/2
-x=0
x=0
x+(x-1\2)=3(x-1\2)
x=3(x-1\2)-(x-1\2)
x=(3-1)(x-1\2)
x=2x-1
-x=-1
x=1
x+x-1/2=3 x-1/2
x=0
解：x+x-1=3x-1
2x-1=3x-1
-x=0
x=0
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