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y in (-oo:+oo)
(2/9)*y^4 = 2/3 // - 2/3
(2/9)*y^4-(2/3) = 0
(2/9)*y^4-2/3 = 0
2/9*y^4 = 2/3 // : 2/9
y^4 = 3
y^4 = 3 // ^ 1/4
abs(y) = 3^(1/4)
y = 3^(1/4) or y = -3^(1/4)
y in { 3^(1/4), -3^(1/4) }
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