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D( i )
-8*i = 0
-8*i = 0
-8*i = 0
-8*i = 0 // : -8
i = 0
i in (-oo:0) U (0:+oo)
7/(-8*i) = 0
-7/8*i^-1 = 0 // : -7/8
i^-1 = 0
i należy do O
i belongs to the empty set
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