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