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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)
(2-(3*i))/(4-i) = 0
(2-3*i)/(4-i) = 0
2-3*i = 0 // - 2
-3*i = -2 // : -3
i = -2/(-3)
i = 2/3
i = 2/3
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