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i in (-oo:+oo)
3-(((7*i)/8)*i) = 0
(-7/8)*i^2+3 = 0
-7/8*i^2 = -3 // : -7/8
i^2 = 24/7
i^2 = 24/7 // ^ 1/2
abs(i) = (24/7)^(1/2)
i = (24/7)^(1/2) or i = -(24/7)^(1/2)
i in { (24/7)^(1/2), -(24/7)^(1/2) }
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