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i in (-oo:+oo)
(i/2)*i-5 = 0
1/2*i^2 = 5 // : 1/2
i^2 = 10
i^2 = 10 // ^ 1/2
abs(i) = 10^(1/2)
i = 10^(1/2) or i = -10^(1/2)
i in { 10^(1/2), -10^(1/2) }
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