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D( x )
8*x^15 = 0
8*x^15 = 0
8*x^15 = 0
8*x^15 = 0 // : 8
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x^15)^(-1/3) = 0
1/2*x^-5 = 0 // : 1/2
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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