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x in (-oo:+oo)
x^2+8*x+(16/3)*x+12 = 0
x^2+40/3*x+12 = 0
DELTA = (40/3)^2-(1*4*12)
DELTA = 1168/9
DELTA > 0
x = ((1168/9)^(1/2)-40/3)/(1*2) or x = (-(1168/9)^(1/2)-40/3)/(1*2)
x = ((1168/9)^(1/2)-40/3)/2 or x = (-((1168/9)^(1/2)+40/3))/2
x in { (-((1168/9)^(1/2)+40/3))/2, ((1168/9)^(1/2)-40/3)/2 }
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