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x in (-oo:+oo)
y = (9*x^8)/3 // - (9*x^8)/3
y-((9*x^8)/3) = 0
y-3*x^8 = 0
-3*x^8 = -y // : -3
x^8 = y/3
x^8 = y/3 // ^ 1/8
abs(x) = (y^(1/8))/(3^(1/8))
x = (y^(1/8))/(3^(1/8)) or x = -((y^(1/8))/(3^(1/8)))
x in { (y^(1/8))/(3^(1/8)), -((y^(1/8))/(3^(1/8))) }
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