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D( x )
(4*x)/9 = 0
(4*x)/9 = 0
(4*x)/9 = 0
4/9*x = 0 // : 4/9
x = 0
x in (-oo:0) U (0:+oo)
((4*x)/9)^-3 = 0
729/64*x^-3 = 0 // : 729/64
x^-3 = 0
x naleu017Cy do O
x belongs to the empty set
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