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D( i )
6*i+8 = 0
6*i+8 = 0
6*i+8 = 0
6*i+8 = 0 // - 8
6*i = -8 // : 6
i = -8/6
i = -4/3
i in (-oo:-4/3) U (-4/3:+oo)
(3-i)/(6*i+8) = 0
3-i = 0 // - 3
-i = -3 // * -1
i = 3
i = 3
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