(3x+1)/12-(1-5x)/8=1
两边乘24
6x+2-3+15x=24
15x+6x=24-2+3
21x=25
x=25/21
3[x-2(x-1/2)=4x
3(x-2x+1)=4x
3-3x=4x
7x=3
x=3/7