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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
y = 6-(2/(x-1)) // - 6-(2/(x-1))
2/(x-1)+y-6 = 0
2/(x-1)+(y*(x-1))/(x-1)+(-6*(x-1))/(x-1) = 0
y*(x-1)-6*(x-1)+2 = 0
x*y-6*x-y+2+6 = 0
x*y-6*x-y+8 = 0
(x*y-6*x-y+8)/(x-1) = 0
(x*y-6*x-y+8)/(x-1) = 0 // * x-1
x*y-6*x-y+8 = 0
8-6*x-y = 0 // - 8-y
-6*x = -(8-y) // : -6
x = (-(8-y))/(-6)
x = (y-8)/(-6)
x = (y-8)/(-6)
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