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