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D( i )
-i-3 = 0
-i-3 = 0
-i-3 = 0
-i-3 = 0 // + 3
-i = 3 // * -1
i = -3
i in (-oo:-3) U (-3:+oo)
(2-(16*i))/(-i-3) = 0
(2-16*i)/(-i-3) = 0
2-16*i = 0 // - 2
-16*i = -2 // : -16
i = -2/(-16)
i = 1/8
i = 1/8
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