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