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a in (-oo:+oo)
((2*a)/3)*a = 5/9 // - 5/9
((2*a)/3)*a-(5/9) = 0
((2*a)/3)*a-5/9 = 0
2/3*a^2 = 5/9 // : 2/3
a^2 = 5/6
a^2 = 5/6 // ^ 1/2
abs(a) = (5/6)^(1/2)
a = (5/6)^(1/2) or a = -(5/6)^(1/2)
a in { (5/6)^(1/2), -(5/6)^(1/2) }
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