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D( i )
4-i = 0
4-i = 0
4-i = 0
4-i = 0 // - 4
-i = -4 // * -1
i = 4
i in (-oo:4) U (4:+oo)
(6-(5*i))/(4-i) = 0
(6-5*i)/(4-i) = 0
6-5*i = 0 // - 6
-5*i = -6 // : -5
i = -6/(-5)
i = 6/5
i = 6/5
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