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D( x )
(2*x)/y = 0
(2*x)/y = 0
(2*x)/y = 0
2*x*y^-1 = 0 // : 2*y^-1
x = 0
x in (-oo:0) U (0:+oo)
((2*x)/y)^-5 = 0
1/32*x^-5*y^5 = 0 // : 1/32*y^5
x^-5 = 0
x należy do O
x belongs to the empty set
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