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