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