x=6/(2x-8)
x(2x-8)=6
2x^2-8x-6=0 |^2
x^2-4x-3=0
D=(-4)^2-4*1*(-3)=16+12=28
x1=(4+2sqrt{7})/2=2+sqrt{7}
x2=(4-2sqrt{7})/2=2-sqrt{7}