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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)
(-(8*i)-10)/(-i-3) = 0
(-8*i-10)/(-i-3) = 0
-8*i-10 = 0 // + 10
-8*i = 10 // : -8
i = 10/(-8)
i = -5/4
i = -5/4
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