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x in (-oo:+oo)
(5*x^2)/3 = 125 // - 125
(5*x^2)/3-125 = 0
5/3*x^2 = 125 // : 5/3
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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