x-1分之3+1-x方分之4x=x+1分之负1
3/x-1+4x/1-x=-1/x+1
3/x-1-4x/x-1=-1/x+1
3-4x/x-1=-1/x+1
(3-4x)(x+1)=-(x-1)
3x+3-4x^2-4x=-x+1
4x^2=2
x^2=1/2
x=±√2/2