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