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D( x )
3^5*a^7*b^-5 = 0
3^5*a^7*b^-5 = 0
3^5*a^7*b^-5 = 0
243*a^7*b^-5 = 0
x naleu017Cy do R
x belongs to the empty set
(3^2*a^5*b^6)/(3^5*a^7*b^-5) = 0
x belongs to the empty set
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