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D( i )
6-(3*i) = 0
6-(3*i) = 0
6-(3*i) = 0
6-3*i = 0
6-3*i = 0 // - 6
-3*i = -6 // : -3
i = -6/(-3)
i = 2
i in (-oo:2) U (2:+oo)
(7*i)/(6-(3*i)) = 0
(7*i)/(6-3*i) = 0
7*i = 0 // : 7
i = 0
i = 0
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