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x in (-oo:+oo)
(1/3)*(3+48)-(2*x^2*x^2) = 0
(1/3)*(3+48)-2*x^4 = 0
-2*x^4 = -17 // : -2
x^4 = 17/2
x^4 = 17/2 // ^ 1/4
abs(x) = (17/2)^(1/4)
x = (17/2)^(1/4) or x = -(17/2)^(1/4)
x in { (17/2)^(1/4), -(17/2)^(1/4) }
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