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