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D( i )
4-(3*i) = 0
4-(3*i) = 0
4-(3*i) = 0
4-3*i = 0
4-3*i = 0 // - 4
-3*i = -4 // : -3
i = -4/(-3)
i = 4/3
i in (-oo:4/3) U (4/3:+oo)
(7-(2*i))/(4-(3*i)) = 0
(7-2*i)/(4-3*i) = 0
7-2*i = 0 // - 7
-2*i = -7 // : -2
i = -7/(-2)
i = 7/2
i = 7/2
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