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i in (-oo:+oo)
3-(i/4)-(9*i) = 0
3-(i/4)-9*i = 0
3-37/4*i = 0 // - 3
-37/4*i = -3 // : -37/4
i = -3/(-37/4)
i = 12/37
i = 12/37
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