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i in (-oo:+oo)
6-(((5*i)/3)*i) = 0
(-5/3)*i^2+6 = 0
-5/3*i^2 = -6 // : -5/3
i^2 = 18/5
i^2 = 18/5 // ^ 1/2
abs(i) = (18/5)^(1/2)
i = (18/5)^(1/2) or i = -(18/5)^(1/2)
i in { (18/5)^(1/2), -(18/5)^(1/2) }
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