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D( x )
(3*x)^(2/3) = 0
(3*x)^(2/3) = 0
(3*x)^(2/3) = 0
3^(2/3)*x^(2/3) = 0 // : 3^(2/3)
x^(2/3) = 0
x = 0
x in (-oo:0) U (0:+oo)
3-(1/((3*x)^(2/3))) = 0
3-(3*x)^(-(2/3)) = 0
-3^(-2/3)*x^(-2/3) = -3 // : -3^(-2/3)
x^(-2/3) = 3/(3^(-2/3))
-2/3 < 0
1/(x^(2/3)) = 3/(3^(-2/3)) // * x^(2/3)
1 = (3/(3^(-2/3)))*x^(2/3) // : 3/(3^(-2/3))
1/(3/(3^(-2/3))) = x^(2/3)
x^(2/3) = 1/(3/(3^(-2/3))) // ^ 3
x^2 = 1/243 // ^ 1/2
abs(x) = (1/243)^(1/2)
x = (1/243)^(1/2) or x = -(1/243)^(1/2)
x in { (1/243)^(1/2), -(1/243)^(1/2) }
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