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D( x )
((a^5)/9)*b^-5 = 0
((a^5)/9)*b^-5 = 0
((a^5)/9)*b^-5 = 0
1/9*a^5*b^-5 = 0
x naleu017Cy do R
x belongs to the empty set
(a^-2*b^-2)/(((a^5)/9)*b^-5) = 0
x belongs to the empty set
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