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Y-9 = (-2/3)*x^6 // - (-2/3)*x^6
Y-((-2/3)*x^6)-9 = 0
Y+(2/3)*x^6-9 = 0
2/3*x^6 = -(Y-9) // : 2/3
x^6 = 3/2*(9-Y)
x^6 = 3/2*(9-Y) // ^ 1/6
abs(x) = (3/2)^(1/6)*(9-Y)^(1/6)
x = (3/2)^(1/6)*(9-Y)^(1/6) or x = -((3/2)^(1/6)*(9-Y)^(1/6))
x in { (3/2)^(1/6)*(9-Y)^(1/6), -((3/2)^(1/6)*(9-Y)^(1/6)) }
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