(x-1分之4x-1)=1-(1-x分之8）
(4x-1)/(x-1)=1-8/(1-x)
(4x-1)/(x-1)=1+8/(x-1)
(4x-1)/(x-1)-1-8/(x-1)=0
(4x-1-x+1-8)/(x-1)=0
(3x-8)/(x-1)=0
3x-8=0
x=8/3