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