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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)
x^2-(25/(x^3)) = 0
x^2-25*x^-3 = 0
x^2-25*x^-3 = 0
x^2*(1-25*x^-5) = 0
-25*x^-5 = -1 // : -25
x^-5 = 1/25
-5 < 0
1/(x^5) = 1/25 // * x^5
1 = 1/25*x^5 // : 1/25
25 = x^5
x^5 = 25 // ^ 1/5
x = 25^(1/5)
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = 25^(1/5)
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