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D( x )
(x+1)^2 = 0
(x+1)^2 = 0
(x+1)^2 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
(1-x)/((x+1)^2) = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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