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i in (-oo:+oo)
-2*i-(-4/6) = -6 // + 6
6-2*i-(-4/6) = 0
2/3-2*i+6 = 0
20/3-2*i = 0 // - 20/3
-2*i = -20/3 // : -2
i = -20/3/(-2)
i = 10/3
i = 10/3
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