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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-3/25) = 5 // - 5
x^(-3/25)-5 = 0
1*x^(-3/25) = 5 // : 1
x^(-3/25) = 5
-3/25 < 0
1/(x^(3/25)) = 5 // * x^(3/25)
1 = 5*x^(3/25) // : 5
1/5 = x^(3/25)
x^(3/25) = 1/5 // ^ 25
x^3 = 1/298023223876953125 // ^ 1/3
x = (1/298023223876953125)^(1/3)
x = (1/298023223876953125)^(1/3)
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