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D( x )
x^6*y^-9 = 0
x^6*y^-9 = 0
x^6*y^-9 = 0
x^6*y^-9 = 0 // : y^-9
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^6*y^-9)^(-2/3) = 0
x^-4*y^6 = 0 // : y^6
x^-4 = 0
x należy do O
x belongs to the empty set
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