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x in (-oo:+oo)
(1/4)*x^2+(5/4)*x+1 = 0
1/4*x^2+5/4*x+1 = 0
DELTA = (5/4)^2-(1/4*1*4)
DELTA = 9/16
DELTA > 0
x = ((9/16)^(1/2)-5/4)/(1/4*2) or x = (-(9/16)^(1/2)-5/4)/(1/4*2)
x = -1 or x = -4
x in { -4, -1 }
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