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i in (-oo:+oo)
((5*i)/(-2))*i+6 = 0
-5/2*i^2 = -6 // : -5/2
i^2 = 12/5
i^2 = 12/5 // ^ 1/2
abs(i) = (12/5)^(1/2)
i = (12/5)^(1/2) or i = -(12/5)^(1/2)
i in { (12/5)^(1/2), -(12/5)^(1/2) }
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