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D( i )
3*i-9 = 0
3*i-9 = 0
3*i-9 = 0
3*i-9 = 0 // + 9
3*i = 9 // : 3
i = 9/3
i = 3
i in (-oo:3) U (3:+oo)
(5-(8*i))/(3*i-9) = 0
(5-8*i)/(3*i-9) = 0
5-8*i = 0 // - 5
-8*i = -5 // : -8
i = -5/(-8)
i = 5/8
i = 5/8
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