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D( x )
(8*x^8)/y = 0
(8*x^8)/y = 0
(8*x^8)/y = 0
8*x^8*y^-1 = 0 // : 8*y^-1
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
((8*x^8)/y)^-3 = 0
1/512*x^-24*y^3 = 0 // : 1/512*y^3
x^-24 = 0
x naleu017Cy do O
x belongs to the empty set
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