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x in (-oo:+oo)
(1/2)*x^2 = 9 // - 9
(1/2)*x^2-9 = 0
1/2*x^2 = 9 // : 1/2
x^2 = 18
x^2 = 18 // ^ 1/2
abs(x) = 3*2^(1/2)
x = 3*2^(1/2) or x = -(3*2^(1/2))
x in { 3*2^(1/2), -(3*2^(1/2)) }
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