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x in (-oo:+oo)
Y = (2/3)*x^9-3 // - (2/3)*x^9-3
Y-((2/3)*x^9)+3 = 0
Y+(-2/3)*x^9+3 = 0
-2/3*x^9 = -(Y+3) // : -2/3
x^9 = 3/2*(Y+3)
x^9 = 3/2*(Y+3) // ^ 1/9
x = (3/2)^(1/9)*(Y+3)^(1/9)
x = (3/2)^(1/9)*(Y+3)^(1/9)
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