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D( i )
2-(4*i) = 0
2-(4*i) = 0
2-(4*i) = 0
2-4*i = 0
2-4*i = 0 // - 2
-4*i = -2 // : -4
i = -2/(-4)
i = 1/2
i in (-oo:1/2) U (1/2:+oo)
(11-(5*i))/(2-(4*i)) = 0
(11-5*i)/(2-4*i) = 0
11-5*i = 0 // - 11
-5*i = -11 // : -5
i = -11/(-5)
i = 11/5
i = 11/5
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