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D( x )
a^3*((9*a^-4*b^7)/20)*b-9 = 0
a^3*((9*a^-4*b^7)/20)*b-9 = 0
a^3*((9*a^-4*b^7)/20)*b-9 = 0
9/20*a^-1*b^8-9 = 0
x naleu017Cy do R
x belongs to the empty set
(a^3*((9*a^-4*b^7)/20)*b-9)^0 = 0
x belongs to the empty set
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