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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^1)/5)*(((((((4*x^-4)/5)*((y^2)/3))/40)/3)*y^-1)/3) = 0
(x/5)*(((((((4*x^-4)/5)*((y^2)/3))/40)/3)*y^-1)/3) = 0
1/6750*x^-3*y = 0 // : 1/6750*y
x^-3 = 0
x należy do O
x belongs to the empty set
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