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