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D( i )
7-(11*i) = 0
7-(11*i) = 0
7-(11*i) = 0
7-11*i = 0
7-11*i = 0 // - 7
-11*i = -7 // : -11
i = -7/(-11)
i = 7/11
i in (-oo:7/11) U (7/11:+oo)
(65*i+5)/(7-(11*i)) = 0
(65*i+5)/(7-11*i) = 0
65*i+5 = 0 // - 5
65*i = -5 // : 65
i = -5/65
i = -1/13
i = -1/13
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