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