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D( x )
45*x^8*y = 0
45*x^8*y = 0
45*x^8*y = 0
45*x^8*y = 0 // : 45*y
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(14*x^6*y^3)/(45*x^8*y) = 0
14/45*x^-2*y^2 = 0 // : 14/45*y^2
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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