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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
0 = 6-(384/(x^3)) // - 6-(384/(x^3))
384/(x^3)-6+0 = 0
384/(x^3)-6 = 0
384*x^-3 = 6 // : 384
x^-3 = 1/64
-3 < 0
1/(x^3) = 1/64 // * x^3
1 = 1/64*x^3 // : 1/64
64 = x^3
x^3 = 64 // ^ 1/3
x = 4
x = 4
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