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D( x )
x^5*((25*x^12*y^4)/12)*y^4 = 0
x^5*((25*x^12*y^4)/12)*y^4 = 0
x^5*((25*x^12*y^4)/12)*y^4 = 0
25/12*x^17*y^8 = 0 // : 25/12*y^8
x^17 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^6*((15*x^4*y^5)/18)*y)/(x^5*((25*x^12*y^4)/12)*y^4) = 0
2/5*x^-7*y^-2 = 0 // : 2/5*y^-2
x^-7 = 0
x naleu017Cy do O
x belongs to the empty set
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