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x in (-oo:+oo)
(1/3)*(6*x)^4 = 180 // - 180
(1/3)*(6*x)^4-180 = 0
432*x^4 = 180 // : 432
x^4 = 5/12
x^4 = 5/12 // ^ 1/4
abs(x) = (5/12)^(1/4)
x = (5/12)^(1/4) or x = -(5/12)^(1/4)
x in { (5/12)^(1/4), -(5/12)^(1/4) }
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