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D( x )
3*x^9*y^15 = 0
3*x^9*y^15 = 0
3*x^9*y^15 = 0
3*x^9*y^15 = 0 // : 3*y^15
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(63*x^20*y^16)/(3*x^9*y^15) = 0
21*x^11*y = 0 // : 21*y
x^11 = 0
x = 0
x in { 0}
x belongs to the empty set
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