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D( x )
5*5*x^3*x^6*y^4*y^5 = 0
5*5*x^3*x^6*y^4*y^5 = 0
5*5*x^3*x^6*y^4*y^5 = 0
25*x^9*y^9 = 0 // : 25*y^9
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(50*x^12*y^10)/(5*5*x^3*x^6*y^4*y^5) = 0
2*x^3*y = 0 // : 2*y
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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