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x in (-oo:+oo)
((-8/9)*x^2)/3 = 5/9 // - 5/9
((-8/9)*x^2)/3-(5/9) = 0
((-8/9)*x^2)/3-5/9 = 0
-8/27*x^2 = 5/9 // : -8/27
x^2 = -15/8
x belongs to the empty set
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