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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)
1 = 1/(x-1) // - 1/(x-1)
1-(1/(x-1)) = 0
1-(x-1)^-1 = 0
1-1/(x-1) = 0
(1*(x-1))/(x-1)-1/(x-1) = 0
1*(x-1)-1 = 0
x-2 = 0
(x-2)/(x-1) = 0
(x-2)/(x-1) = 0 // * x-1
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 2
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