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6*x^2+13*x+(5/2)*x+1 = 0
6*x^2+31/2*x+1 = 0
DELTA = (31/2)^2-(1*4*6)
DELTA = 865/4
DELTA > 0
x = ((865/4)^(1/2)-31/2)/(2*6) or x = (-(865/4)^(1/2)-31/2)/(2*6)
x = ((865/4)^(1/2)-31/2)/12 or x = (-((865/4)^(1/2)+31/2))/12
x in { (-((865/4)^(1/2)+31/2))/12, ((865/4)^(1/2)-31/2)/12 }
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