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