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x in (-oo:+oo)
(x^2)/2-(x/2) = -1/8 // + -1/8
(x^2)/2-(x/2)-(-1/8) = 0
(x^2)/2-(x/2)+1/8 = 0
1/2*x^2-1/2*x+1/8 = 0
DELTA = (-1/2)^2-(1/8*1/2*4)
DELTA = 0
x = 1/2/(1/2*2)
x = 1/2 or x = 1/2
x in { 1/2, 1/2 }
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