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i in (-oo:+oo)
8-(((2*i)/3)*i) = 0
(-2/3)*i^2+8 = 0
-2/3*i^2 = -8 // : -2/3
i^2 = 12
i^2 = 12 // ^ 1/2
abs(i) = 2*3^(1/2)
i = 2*3^(1/2) or i = -(2*3^(1/2))
i in { 2*3^(1/2), -(2*3^(1/2)) }
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