2/3[3/2(1/4x-1)-7/2]=x[3/2(1/4x-1)-7/2]=3/2*x3/2(1/4x-1)-7/2=3/2*x3/8*x-3/2*x-3/2-7/2=0-9/8*x=5 x=-40/9
解:2/3[2/3(1/4x-1)-7/2]=x 2/3*2/3(1/4x-1)-2/3*2/7=x 1/4x-1-3/7=x 3/4x=-10/3 x=-40/9