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