-X+6=4/X,X≠0,则有
-X^2 + 6X =4
X^2 - 6X +4 =0
判别式∆ = (-6)^2 -4*4= 20
则根据韦达定理X= (6∓√20)/2= 3∓√5,所以
X₁=3+√5,X₂=3-√5