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