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D( x )
(a^7*b^-8)/3 = 0
(a^7*b^-8)/3 = 0
(a^7*b^-8)/3 = 0
1/3*a^7*b^-8 = 0
x naleu017Cy do R
x belongs to the empty set
((a^-4*b^-1)/4)/((a^7*b^-8)/3) = 0
x belongs to the empty set
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