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D( x )
x^13 = 0
x^13 = 0
x^13 = 0
1*x^13 = 0 // : 1
x^13 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((X^4*y^3)^5)/(x^13))*y^6 = 0
X^20*x^-13*y^21 = 0 // : X^20*y^21
x^-13 = 0
x należy do O
x belongs to the empty set
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