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D( i )
4-(2*i) = 0
4-(2*i) = 0
4-(2*i) = 0
4-2*i = 0
4-2*i = 0 // - 4
-2*i = -4 // : -2
i = -4/(-2)
i = 2
i in (-oo:2) U (2:+oo)
(7-i)/(4-(2*i)) = 0
(7-i)/(4-2*i) = 0
7-i = 0 // - 7
-i = -7 // * -1
i = 7
i = 7
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