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D( i )
6-(6*i) = 0
6-(6*i) = 0
6-(6*i) = 0
6-6*i = 0
6-6*i = 0 // - 6
-6*i = -6 // : -6
i = -6/(-6)
i = 1
i in (-oo:1) U (1:+oo)
36/(6-(6*i)) = 0
36/(6-6*i) = 0
i belongs to the empty set
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