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x in (-oo:+oo)
(3*x^2)/3-16 = 59 // - 59
(3*x^2)/3-59-16 = 0
1*x^2 = 75 // : 1
x^2 = 75
x^2 = 75 // ^ 1/2
abs(x) = 5*3^(1/2)
x = 5*3^(1/2) or x = -(5*3^(1/2))
x in { 5*3^(1/2), -(5*3^(1/2)) }
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