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D( i )
3-(2*i) = 0
3-(2*i) = 0
3-(2*i) = 0
3-2*i = 0
3-2*i = 0 // - 3
-2*i = -3 // : -2
i = -3/(-2)
i = 3/2
i in (-oo:3/2) U (3/2:+oo)
(12-(5*i))/(3-(2*i)) = 0
(12-5*i)/(3-2*i) = 0
12-5*i = 0 // - 12
-5*i = -12 // : -5
i = -12/(-5)
i = 12/5
i = 12/5
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