两边乘6
3[x-1/2(x-1)]=4(x-1)
3x-3/2(x-1)=4(x-1)
两边乘2
6x-3(x-1)=8(x-1)
6x-3x+3=8x-8
8x-6x+3x=3+8
5x=11
x=11÷5
x=11/5