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