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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/25 = x^(-1/3) // - x^(-1/3)
1/25-x^(-1/3) = 0
-1*x^(-1/3) = -1/25 // : -1
x^(-1/3) = 1/25
-1/3 < 0
1/(x^(1/3)) = 1/25 // * x^(1/3)
1 = 1/25*x^(1/3) // : 1/25
25 = x^(1/3)
x^(1/3) = 25 // ^ 3
x = 15625
x = 15625
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