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D( i )
2-(8*i) = 0
2-(8*i) = 0
2-(8*i) = 0
2-8*i = 0
2-8*i = 0 // - 2
-8*i = -2 // : -8
i = -2/(-8)
i = 1/4
i in (-oo:1/4) U (1/4:+oo)
4/(2-(8*i)) = 0
4/(2-8*i) = 0
4 = 0
i belongs to the empty set
i belongs to the empty set
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