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D( i )
7-(4*i) = 0
7-(4*i) = 0
7-(4*i) = 0
7-4*i = 0
7-4*i = 0 // - 7
-4*i = -7 // : -4
i = -7/(-4)
i = 7/4
i in (-oo:7/4) U (7/4:+oo)
(9*i)/(7-(4*i)) = 0
(9*i)/(7-4*i) = 0
9*i = 0 // : 9
i = 0
i = 0
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