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i in (-oo:+oo)
4-(((6*i)/2)*i) = 0
4-3*i^2 = 0
-3*i^2 = -4 // : -3
i^2 = 4/3
i^2 = 4/3 // ^ 1/2
abs(i) = (4/3)^(1/2)
i = (4/3)^(1/2) or i = -(4/3)^(1/2)
i in { (4/3)^(1/2), -(4/3)^(1/2) }
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