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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
X^-3 = 27/64 // - 27/64
X^-3-(27/64) = 0
X^-3-27/64 = 0
1*X^-3 = 27/64 // : 1
X^-3 = 27/64
-3 < 0
1/(X^3) = 27/64 // * X^3
1 = 27/64*X^3 // : 27/64
64/27 = X^3
X^3 = 64/27 // ^ 1/3
X = 4/3
X = 4/3
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