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D( x )
(1/3)*x = 0
(1/3)*x = 0
(1/3)*x = 0
1/3*x = 0 // : 1/3
x = 0
x in (-oo:0) U (0:+oo)
((1/3)*x)^-5 = 0
243*x^-5 = 0 // : 243
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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