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