符号清晰.（x为未知数,*为乘号,1/9就是九分之一）,求X.

(x-1)*1/9+1={x-[(x-1)*1/9+1]-2}*1/9+2
x/9-1/9+1=[x-(x/9-1/9+1)-2]*1/9+2
x/9+8/9=(8x/9-8/9-2)*1/9+2
两边乘9
x+8=8x/9-26/9+18
x-8x/9=18-8-26/9
x/9=64/9
x=64