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x in (-oo:+oo)
(2*x^4)/3 = 162 // - 162
(2*x^4)/3-162 = 0
2/3*x^4 = 162 // : 2/3
x^4 = 243
x^4 = 243 // ^ 1/4
abs(x) = 3*3^(1/4)
x = 3*3^(1/4) or x = -(3*3^(1/4))
x in { 3*3^(1/4), -(3*3^(1/4)) }
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