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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-3)/2 = 8 // - 8
(x^-3)/2-8 = 0
1/2*x^-3 = 8 // : 1/2
x^-3 = 16
-3 < 0
1/(x^3) = 16 // * x^3
1 = 16*x^3 // : 16
1/16 = x^3
x^3 = 1/16 // ^ 1/3
x = (1/16)^(1/3)
x = (1/16)^(1/3)
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