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D( i )
7-(5*i) = 0
7-(5*i) = 0
7-(5*i) = 0
7-5*i = 0
7-5*i = 0 // - 7
-5*i = -7 // : -5
i = -7/(-5)
i = 7/5
i in (-oo:7/5) U (7/5:+oo)
(3*i+6)/(7-(5*i)) = 0
(3*i+6)/(7-5*i) = 0
3*i+6 = 0 // - 6
3*i = -6 // : 3
i = -6/3
i = -2
i = -2
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