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