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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(3*x^(-2/3)) = 0
1-3*x^(-2/3) = 0
-3*x^(-2/3) = -1 // : -3
x^(-2/3) = 1/3
-2/3 < 0
1/(x^(2/3)) = 1/3 // * x^(2/3)
1 = 1/3*x^(2/3) // : 1/3
3 = x^(2/3)
x^(2/3) = 3 // ^ 3
x^2 = 27 // ^ 1/2
abs(x) = 3*3^(1/2)
x = 3*3^(1/2) or x = -(3*3^(1/2))
x in { 3*3^(1/2), -(3*3^(1/2)) }
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