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x in (-oo:+oo)
y = (5/3)*x^6-8 // - (5/3)*x^6-8
y-((5/3)*x^6)+8 = 0
(-5/3)*x^6+y+8 = 0
-5/3*x^6 = -(y+8) // : -5/3
x^6 = 3/5*(y+8)
x^6 = 3/5*(y+8) // ^ 1/6
abs(x) = (3/5)^(1/6)*(y+8)^(1/6)
x = (3/5)^(1/6)*(y+8)^(1/6) or x = -((3/5)^(1/6)*(y+8)^(1/6))
x in { (3/5)^(1/6)*(y+8)^(1/6), -((3/5)^(1/6)*(y+8)^(1/6)) }
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