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D( x )
x < 0
x^2.5 = 0
x < 0
x^2.5 = 0
x^2.5 = 0
1*x^2.5 = 0 // : 1
x^2.5 = 0
x = 0
x in (0:+oo)
8/(x^2.5) = 0.5 // - 0.5
8/(x^2.5)-0.5 = 0
8*x^-2.5 = 0.5 // : 8
x^-2.5 = 0.0625
-2.5 < 0
1/(x^2.5) = 0.0625 // * x^2.5
1 = 0.0625*x^2.5 // : 0.0625
16 = x^2.5
x^2 = 16^(1/0.5) // ^ 1/2
abs(x) = 16
x = 16 or x = -16
x in { -16}
x = 16
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