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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)
(2*i+5)/(i+6) = 0
2*i+5 = 0 // - 5
2*i = -5 // : 2
i = -5/2
i = -5/2
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