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x in (-oo:+oo)
(1/3)*x^4 = 27 // - 27
(1/3)*x^4-27 = 0
1/3*x^4 = 27 // : 1/3
x^4 = 81
x^4 = 81 // ^ 1/4
abs(x) = 3
x = 3 or x = -3
x in { 3, -3 }
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