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D( i )
3*i-7 = 0
3*i-7 = 0
3*i-7 = 0
3*i-7 = 0 // + 7
3*i = 7 // : 3
i = 7/3
i in (-oo:7/3) U (7/3:+oo)
(-(3*i)-7)/(3*i-7) = 0
(-3*i-7)/(3*i-7) = 0
-3*i-7 = 0 // + 7
-3*i = 7 // : -3
i = 7/(-3)
i = -7/3
i = -7/3
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