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(-1/3)*x^2+(1/2)*x+1/4 = 0
1/2*x-1/3*x^2+1/4 = 0
DELTA = (1/2)^2-(-1/3*1/4*4)
DELTA = 7/12
DELTA > 0
x = ((7/12)^(1/2)-1/2)/(-1/3*2) or x = (-(7/12)^(1/2)-1/2)/(-1/3*2)
x = -3/2*((7/12)^(1/2)-1/2) or x = 3/2*((7/12)^(1/2)+1/2)
x in { -3/2*((7/12)^(1/2)-1/2), 3/2*((7/12)^(1/2)+1/2) }
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