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a^2*b^3*((12*a^4*b^6-(15*a^5*b^3))/3) = 0
a^2*b^3*((12*a^4*b^6-15*a^5*b^3)/3) = 0
(a^2*b^3*(12*a^4*b^6-15*a^5*b^3))/3 = 0
x belongs to the empty set
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