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i in (-oo:+oo)
12-(((7*i)/6)*i) = 0
(-7/6)*i^2+12 = 0
-7/6*i^2 = -12 // : -7/6
i^2 = 72/7
i^2 = 72/7 // ^ 1/2
abs(i) = (72/7)^(1/2)
i = (72/7)^(1/2) or i = -(72/7)^(1/2)
i in { (72/7)^(1/2), -(72/7)^(1/2) }
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