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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)
((x-2)*(3*x+1))/(1-x) = 0
( 3*x+1 )
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -1/3, 2 }
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