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D( x )
1/(x-1)-1 = 0
x-1 = 0
1/(x-1)-1 = 0
1/(x-1)-1 = 0
1/(x-1)+(-1*(x-1))/(x-1) = 0
1-1*(x-1) = 0
2-x = 0
(2-x)/(x-1) = 0
(2-x)/(x-1) = 0 // * x-1
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:2) U (2:+oo)
1/(1/(x-1)-1) = 0
1/(x-1)-1 = 0
1/(x-1)+(-1*(x-1))/(x-1) = 0
1-1*(x-1) = 0
2-x = 0
(2-x)/(x-1) = 0
(2-x)/(x-1) = 0 // * x-1
2-x = 0
1/(2-x) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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