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D( i )
9-(17*i) = 0
9-(17*i) = 0
9-(17*i) = 0
9-17*i = 0
9-17*i = 0 // - 9
-17*i = -9 // : -17
i = -9/(-17)
i = 9/17
i in (-oo:9/17) U (9/17:+oo)
(6*i+14)/(9-(17*i)) = 0
(6*i+14)/(9-17*i) = 0
6*i+14 = 0 // - 14
6*i = -14 // : 6
i = -14/6
i = -7/3
i = -7/3
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