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x in (-oo:+oo)
(x^2)/2 = 18 // - 18
(x^2)/2-18 = 0
1/2*x^2 = 18 // : 1/2
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6, -6 }
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