去分母，等式两边乘以123(12x-1)-2(18x+1)=4x化简得36x-3-36x-2=4x4x=-5x=-5/4
[(12x-1)/4]-[(18x+1)/6]=x/3 解：3(12x-1)-2(18x+1)=4x 36x-3-36x-2=4x -6=4xx=-1.5
3x-1/4-3x-1/6=x/3x=-(3/4+1/2)=-5/4
