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x in (-oo:+oo)
(x^2)/5 = 10/11 // - 10/11
(x^2)/5-(10/11) = 0
(x^2)/5-10/11 = 0
1/5*x^2 = 10/11 // : 1/5
x^2 = 50/11
x^2 = 50/11 // ^ 1/2
abs(x) = (50/11)^(1/2)
x = (50/11)^(1/2) or x = -(50/11)^(1/2)
x in { (50/11)^(1/2), -(50/11)^(1/2) }
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