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