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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)
1/(x^2)-8 = 6 // - 6
1/(x^2)-8-6 = 0
1*x^-2 = 14 // : 1
x^-2 = 14
-2 < 0
1/(x^2) = 14 // * x^2
1 = 14*x^2 // : 14
1/14 = x^2
x^2 = 1/14 // ^ 1/2
abs(x) = (1/14)^(1/2)
x = (1/14)^(1/2) or x = -(1/14)^(1/2)
x in { (1/14)^(1/2), -(1/14)^(1/2) }
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