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D( x )
81*y^6*z^-12 = 0
81*y^6*z^-12 = 0
81*y^6*z^-12 = 0
81*y^6*z^-12 = 0
x naleu017Cy do R
x belongs to the empty set
(X^-9)/(81*y^6*z^-12) = 0
x belongs to the empty set
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