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