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