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i in (-oo:+oo)
8-(((6*i)/3)*i) = 0
8-2*i^2 = 0
-2*i^2 = -8 // : -2
i^2 = 4
i^2 = 4 // ^ 1/2
abs(i) = 2
i = 2 or i = -2
i in { 2, -2 }
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