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D( i )
4-(5*i) = 0
4-(5*i) = 0
4-(5*i) = 0
4-5*i = 0
4-5*i = 0 // - 4
-5*i = -4 // : -5
i = -4/(-5)
i = 4/5
i in (-oo:4/5) U (4/5:+oo)
(3*i)/(4-(5*i)) = 0
(3*i)/(4-5*i) = 0
3*i = 0 // : 3
i = 0
i = 0
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