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i in (-oo:+oo)
2/3-((1/2)*i) = 0
(-1/2)*i+2/3 = 0
2/3-1/2*i = 0 // - 2/3
-1/2*i = -2/3 // : -1/2
i = -2/3/(-1/2)
i = 4/3
i = 4/3
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