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x in (-oo:+oo)
6*x^(2/3) = 1 // - 1
6*x^(2/3)-1 = 0
6*x^(2/3) = 1 // : 6
x^(2/3) = 1/6
x^(2/3) = 1/6 // ^ 3
x^2 = 1/216 // ^ 1/2
abs(x) = (1/216)^(1/2)
x = (1/216)^(1/2) or x = -(1/216)^(1/2)
x in { (1/216)^(1/2), -(1/216)^(1/2) }
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