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x in (-oo:+oo)
2-((2/3)*x^8) = 0
(-2/3)*x^8+2 = 0
-2/3*x^8 = -2 // : -2/3
x^8 = 3
x^8 = 3 // ^ 1/8
abs(x) = 3^(1/8)
x = 3^(1/8) or x = -3^(1/8)
x in { 3^(1/8), -3^(1/8) }
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