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