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