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D( i )
9*i+8 = 0
9*i+8 = 0
9*i+8 = 0
9*i+8 = 0 // - 8
9*i = -8 // : 9
i = -8/9
i in (-oo:-8/9) U (-8/9:+oo)
(3*i+2)/(9*i+8) = 0
3*i+2 = 0 // - 2
3*i = -2 // : 3
i = -2/3
i = -2/3
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