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D( i )
i+9 = 0
i+9 = 0
i+9 = 0
i+9 = 0 // - 9
i = -9
i in (-oo:-9) U (-9:+oo)
(8*i+6)/(i+9) = 0
8*i+6 = 0 // - 6
8*i = -6 // : 8
i = -6/8
i = -3/4
i = -3/4
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