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x in (-oo:+oo)
(2/3)*x^4 = 2/3 // - 2/3
(2/3)*x^4-(2/3) = 0
(2/3)*x^4-2/3 = 0
2/3*x^4 = 2/3 // : 2/3
x^4 = 1
x^4 = 1 // ^ 1/4
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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