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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/(x-1) = 2 // - 2
y/(x-1)-2 = 0
y/(x-1)+(-2*(x-1))/(x-1) = 0
y-2*(x-1) = 0
y-2*x+2 = 0
(y-2*x+2)/(x-1) = 0
(y-2*x+2)/(x-1) = 0 // * x-1
y-2*x+2 = 0
y-2*x+2 = 0 // - y+2
-2*x = -(y+2) // : -2
x = (-(y+2))/(-2)
x = (y+2)/2
x = (y+2)/2
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