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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)
x-(2*x)-(2/(x^2)) = 0
x-2*x-2*x^-2 = 0
-x-2*x^-2 = 0
-x*(2*x^-3+1) = 0
2*x^-3 = -1 // : 2
x^-3 = -1/2
-3 < 0
1/(x^3) = -1/2 // * x^3
1 = -1/2*x^3 // : -1/2
-2 = x^3
x^3 = -2 // ^ 1/3
x = -2^(1/3)
-x = 0
-1*x = 0 // : -1
x = 0
x in { 0}
x = -2^(1/3)
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