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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-2/3) = 25 // - 25
x^(-2/3)-25 = 0
1*x^(-2/3) = 25 // : 1
x^(-2/3) = 25
-2/3 < 0
1/(x^(2/3)) = 25 // * x^(2/3)
1 = 25*x^(2/3) // : 25
1/25 = x^(2/3)
x^(2/3) = 1/25 // ^ 3
x^2 = 1/15625 // ^ 1/2
abs(x) = 1/125
x = 1/125 or x = -1/125
x in { 1/125, -1/125 }
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