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x in (-oo:+oo)
(x^2)/2 = x-(5/4) // - x-(5/4)
(x^2)/2-x+5/4 = 0
1/2*x^2-x+5/4 = 0
DELTA = (-1)^2-(1/2*5/4*4)
DELTA = -3/2
DELTA < 0
x belongs to the empty set
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