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D( i )
1-i = 0
1-i = 0
1-i = 0
1-i = 0 // - 1
-i = -1 // * -1
i = 1
i in (-oo:1) U (1:+oo)
(7-(5*i))/(1-i) = 0
(7-5*i)/(1-i) = 0
7-5*i = 0 // - 7
-5*i = -7 // : -5
i = -7/(-5)
i = 7/5
i = 7/5
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