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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((5/8)/1)/2)/x = 0
((5/8)/2)/x = 0
5/16*x^-1 = 0 // : 5/16
x^-1 = 0
x należy do O
x belongs to the empty set
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