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D( x )
a^4*b^4 = 0
a^4*b^4 = 0
a^4*b^4 = 0
a^4*b^4 = 0
x naleu017Cy do R
x belongs to the empty set
(a^7*b^8)/(a^4*b^4) = 0
x belongs to the empty set
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