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X in (-oo:+oo)
(X^2)/3 = -5/6 // + -5/6
(X^2)/3-(-5/6) = 0
(X^2)/3+5/6 = 0
1/3*X^2 = -5/6 // : 1/3
X^2 = -5/2
X belongs to the empty set
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