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