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