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x in (-oo:+oo)
(x^4)/3 = 625 // - 625
(x^4)/3-625 = 0
1/3*x^4 = 625 // : 1/3
x^4 = 1875
x^4 = 1875 // ^ 1/4
abs(x) = 5*3^(1/4)
x = 5*3^(1/4) or x = -(5*3^(1/4))
x in { 5*3^(1/4), -(5*3^(1/4)) }
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