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D( i )
5-(3*i) = 0
5-(3*i) = 0
5-(3*i) = 0
5-3*i = 0
5-3*i = 0 // - 5
-3*i = -5 // : -3
i = -5/(-3)
i = 5/3
i in (-oo:5/3) U (5/3:+oo)
(5*i+9)/(5-(3*i)) = 0
(5*i+9)/(5-3*i) = 0
5*i+9 = 0 // - 9
5*i = -9 // : 5
i = -9/5
i = -9/5
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