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D( i )
5-i = 0
5-i = 0
5-i = 0
5-i = 0 // - 5
-i = -5 // * -1
i = 5
i in (-oo:5) U (5:+oo)
(2-(5*i))/(5-i) = 0
(2-5*i)/(5-i) = 0
2-5*i = 0 // - 2
-5*i = -2 // : -5
i = -2/(-5)
i = 2/5
i = 2/5
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