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D( x )
x = 0
5*y-4 = 0
x = 0
x = 0
5*y-4 = 0
5*y-4 = 0
5*y-4 = 0
x naleu017Cy do R
x belongs to the empty set
((6*x^-5*y^3)/(5*y-4))^2 = 0
x belongs to the empty set
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