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D( x )
x = 0
x^-9*y = 0
(x^9*y^-1)^8 = 0
x = 0
x = 0
x^-9*y = 0
x^-9*y = 0
x^-9*y = 0 // : y
x^-9 = 0
x naleu017Cy do O
(x^9*y^-1)^8 = 0
(x^9*y^-1)^8 = 0
x^72*y^-8 = 0 // : y^-8
x^72 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-9*y)^-8)/((x^9*y^-1)^8) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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