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D( i )
-(8*i)-2 = 0
-(8*i)-2 = 0
-(8*i)-2 = 0
-8*i-2 = 0
-8*i-2 = 0 // + 2
-8*i = 2 // : -8
i = 2/(-8)
i = -1/4
i in (-oo:-1/4) U (-1/4:+oo)
(8*i)/(-(8*i)-2) = 0
(8*i)/(-8*i-2) = 0
8*i = 0 // : 8
i = 0
i = 0
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