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