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D( i )
6-(7*i) = 0
6-(7*i) = 0
6-(7*i) = 0
6-7*i = 0
6-7*i = 0 // - 6
-7*i = -6 // : -7
i = -6/(-7)
i = 6/7
i in (-oo:6/7) U (6/7:+oo)
8/(6-(7*i)) = 0
8/(6-7*i) = 0
8 = 0
i belongs to the empty set
i belongs to the empty set
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