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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)
2 = 6/(x^3) // - 6/(x^3)
2-(6/(x^3)) = 0
2-6*x^-3 = 0
-6*x^-3 = -2 // : -6
x^-3 = 1/3
-3 < 0
1/(x^3) = 1/3 // * x^3
1 = 1/3*x^3 // : 1/3
3 = x^3
x^3 = 3 // ^ 1/3
x = 3^(1/3)
x = 3^(1/3)
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