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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^-3)/2 = 128 // - 128
(2*x^-3)/2-128 = 0
1*x^-3 = 128 // : 1
x^-3 = 128
-3 < 0
1/(x^3) = 128 // * x^3
1 = 128*x^3 // : 128
1/128 = x^3
x^3 = 1/128 // ^ 1/3
x = (1/128)^(1/3)
x = (1/128)^(1/3)
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