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D( x )
x = 0
(5*x^-1)/2 = 0
x = 0
x = 0
(5*x^-1)/2 = 0
(5*x^-1)/2 = 0
5/2*x^-1 = 0 // : 5/2
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((5*x^-1)/2)^-2 = 0
4/25*x^2 = 0 // : 4/25
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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