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i in (-oo:+oo)
((35*i)/(-7))*i+6 = 0
-5*i^2 = -6 // : -5
i^2 = 6/5
i^2 = 6/5 // ^ 1/2
abs(i) = (6/5)^(1/2)
i = (6/5)^(1/2) or i = -(6/5)^(1/2)
i in { (6/5)^(1/2), -(6/5)^(1/2) }
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