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D( x )
25*x^3*y^15 = 0
25*x^3*y^15 = 0
25*x^3*y^15 = 0
25*x^3*y^15 = 0 // : 25*y^15
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^12*y^5)/(25*x^3*y^15) = 0
1/5*x^9*y^-10 = 0 // : 1/5*y^-10
x^9 = 0
x = 0
x in { 0}
x belongs to the empty set
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