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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) = 3 // - 3
1/(1-x)-3 = 0
1/(1-x)+(-3*(1-x))/(1-x) = 0
1-3*(1-x) = 0
3*x-2 = 0
(3*x-2)/(1-x) = 0
(3*x-2)/(1-x) = 0 // * 1-x
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x = 2/3
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