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x in (-oo:+oo)
(1/6)*x^2 = 48 // - 48
(1/6)*x^2-48 = 0
1/6*x^2 = 48 // : 1/6
x^2 = 288
x^2 = 288 // ^ 1/2
abs(x) = 12*2^(1/2)
x = 12*2^(1/2) or x = -(12*2^(1/2))
x in { 12*2^(1/2), -(12*2^(1/2)) }
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