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D( i )
5-(4*i) = 0
5-(4*i) = 0
5-(4*i) = 0
5-4*i = 0
5-4*i = 0 // - 5
-4*i = -5 // : -4
i = -5/(-4)
i = 5/4
i in (-oo:5/4) U (5/4:+oo)
(8*i)/(5-(4*i)) = 0
(8*i)/(5-4*i) = 0
8*i = 0 // : 8
i = 0
i = 0
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