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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)
(1*i-6)/(6-(3*i)) = 0
(i-6)/(6-3*i) = 0
i-6 = 0 // + 6
i = 6
i = 6
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