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x in (-oo:+oo)
2*x^(4/3) = 162 // - 162
2*x^(4/3)-162 = 0
2*x^(4/3) = 162 // : 2
x^(4/3) = 81
x^(4/3) = 81 // ^ 3
x^4 = 531441 // ^ 1/4
abs(x) = 27
x = 27 or x = -27
x in { 27, -27 }
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