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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/9)*x^-2*y^1 = 0
(1/9)*x^-2*y = 0
1/9*x^-2*y = 0 // : 1/9*y
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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