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D( x )
x^2-1 = 0
x = 0
x^2-1 = 0
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x = 0
x = 0
x in (-oo:-1) U (-1:0) U (0:1) U (1:+oo)
(2*x)/(x^2-1) = 5/x // - 5/x
(2*x)/(x^2-1)-(5/x) = 0
(2*x)/(x^2-1)-5*x^-1 = 0
(2*x)/(x^2-1)-5/x = 0
(2*x*x)/(x*(x^2-1))+(-5*(x^2-1))/(x*(x^2-1)) = 0
2*x*x-5*(x^2-1) = 0
5-3*x^2 = 0
(5-3*x^2)/(x*(x^2-1)) = 0
(5-3*x^2)/(x*(x^2-1)) = 0 // * x*(x^2-1)
5-3*x^2 = 0
-3*x^2 = -5 // : -3
x^2 = 5/3
x^2 = 5/3 // ^ 1/2
abs(x) = (5/3)^(1/2)
x = (5/3)^(1/2) or x = -(5/3)^(1/2)
x in { (5/3)^(1/2), -(5/3)^(1/2) }
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