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D( x )
15*y = 0
3*y = 0
8*x^3*y^5 = 0
15*y = 0
15*y = 0
15*y = 0
x naleu017Cy do R
3*y = 0
3*y = 0
3*y = 0
x naleu017Cy do R
8*x^3*y^5 = 0
8*x^3*y^5 = 0
8*x^3*y^5 = 0 // : 8*y^5
x^3 = 0
x = 0
x belongs to the empty set
(((2*x)/(3*y))/(8*x^3*y^5))/(15*y) = 0
x belongs to the empty set
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