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