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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30*x^(-2/3)-x^(1/3) = 0
t_1 = x^(1/3)
30*t_1^-2-1*t_1^1 = 0
30*t_1^-2-t_1 = 0
t_1*(30*t_1^-3-1) = 0
30*t_1^-3 = 1 // : 30
t_1^-3 = 1/30
-3 < 0
1/(t_1^3) = 1/30 // * t_1^3
1 = 1/30*t_1^3 // : 1/30
30 = t_1^3
t_1^3 = 30 // ^ 1/3
t_1 = 30^(1/3)
t_1 = 0
t_1 = 0
t_1 = 30^(1/3)
x^(1/3)-30^(1/3) = 0
1*x^(1/3) = 30^(1/3) // : 1
x^(1/3) = 30^(1/3)
x^(1/3) = 30^(1/3) // ^ 3
x = 30
t_1 = 0
x^(1/3)+0 = 0
x^(1/3) = 0
1*x^(1/3) = 0 // : 1
x^(1/3) = 0
x = 0
x in { 0}
x = 30
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