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i in (-oo:+oo)
6-(((8*i)/3)*i) = 0
(-8/3)*i^2+6 = 0
-8/3*i^2 = -6 // : -8/3
i^2 = 9/4
i^2 = 9/4 // ^ 1/2
abs(i) = 3/2
i = 3/2 or i = -3/2
i in { 3/2, -3/2 }
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