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D( i )
1-(2*i) = 0
1-(2*i) = 0
1-(2*i) = 0
1-2*i = 0
1-2*i = 0 // - 1
-2*i = -1 // : -2
i = -1/(-2)
i = 1/2
i in (-oo:1/2) U (1/2:+oo)
(5-(3*i))/(1-(2*i)) = 0
(5-3*i)/(1-2*i) = 0
5-3*i = 0 // - 5
-3*i = -5 // : -3
i = -5/(-3)
i = 5/3
i = 5/3
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