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