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D( i )
3*i+4 = 0
4-(3*i) = 0
3*i+4 = 0
3*i+4 = 0
3*i+4 = 0 // - 4
3*i = -4 // : 3
i = -4/3
4-(3*i) = 0
4-(3*i) = 0
4-3*i = 0
4-3*i = 0 // - 4
-3*i = -4 // : -3
i = -4/(-3)
i = 4/3
i in (-oo:-4/3) U (-4/3:4/3) U (4/3:+oo)
(1/(3*i+4))*((4-(3*i))/(4-(3*i))) = 0
(1/(3*i+4))*((4-3*i)/(4-3*i)) = 0
1/(3*i+4) = 0
i belongs to the empty set
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