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x in (-oo:+oo)
(3*x^2)/2 = 60 // - 60
(3*x^2)/2-60 = 0
3/2*x^2 = 60 // : 3/2
x^2 = 40
x^2 = 40 // ^ 1/2
abs(x) = 2*10^(1/2)
x = 2*10^(1/2) or x = -(2*10^(1/2))
x in { 2*10^(1/2), -(2*10^(1/2)) }
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