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D( x )
x^5 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x^3*y^6)/(x^5))*y = 0
4*x^-2*y^7 = 0 // : 4*y^7
x^-2 = 0
x należy do O
x belongs to the empty set
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