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i in (-oo:+oo)
11-(((5*i)/9)*i) = 0
(-5/9)*i^2+11 = 0
-5/9*i^2 = -11 // : -5/9
i^2 = 99/5
i^2 = 99/5 // ^ 1/2
abs(i) = (99/5)^(1/2)
i = (99/5)^(1/2) or i = -(99/5)^(1/2)
i in { (99/5)^(1/2), -(99/5)^(1/2) }
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