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(1/4)*x^2-x-3 = 0
1/4*x^2-x-3 = 0
DELTA = (-1)^2-(-3*1/4*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+1)/(1/4*2) or x = (1-4^(1/2))/(1/4*2)
x = 6 or x = -2
x in { -2, 6 }
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