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i in (-oo:+oo)
3-(i/3)-(6*i) = 0
3-(i/3)-6*i = 0
3-19/3*i = 0 // - 3
-19/3*i = -3 // : -19/3
i = -3/(-19/3)
i = 9/19
i = 9/19
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