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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)
14/(x^3)+1 = 0
14*x^-3 = -1 // : 14
x^-3 = -1/14
-3 < 0
1/(x^3) = -1/14 // * x^3
1 = -1/14*x^3 // : -1/14
-14 = x^3
x^3 = -14 // ^ 1/3
x = -14^(1/3)
x = -14^(1/3)
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