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D( i )
7-(2*i) = 0
7-(2*i) = 0
7-(2*i) = 0
7-2*i = 0
7-2*i = 0 // - 7
-2*i = -7 // : -2
i = -7/(-2)
i = 7/2
i in (-oo:7/2) U (7/2:+oo)
(3-(5*i))/(7-(2*i)) = 0
(3-5*i)/(7-2*i) = 0
3-5*i = 0 // - 3
-5*i = -3 // : -5
i = -3/(-5)
i = 3/5
i = 3/5
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