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D( i )
4-(5*i) = 0
4-(5*i) = 0
4-(5*i) = 0
4-5*i = 0
4-5*i = 0 // - 4
-5*i = -4 // : -5
i = -4/(-5)
i = 4/5
i in (-oo:4/5) U (4/5:+oo)
(7-(3*i))/(4-(5*i)) = 0
(7-3*i)/(4-5*i) = 0
7-3*i = 0 // - 7
-3*i = -7 // : -3
i = -7/(-3)
i = 7/3
i = 7/3
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