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D( x )
2*x^3 = 0
2*x^3 = 0
2*x^3 = 0
2*x^3 = 0 // : 2
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
6/(2*x^3)+3 = 0
3*x^-3 = -3 // : 3
x^-3 = -1
-3 < 0
1/(x^3) = -1 // * x^3
1 = -1*x^3 // : -1
-1 = x^3
x^3 = -1 // ^ 1/3
x = -1
x = -1
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