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x^2+4*x-(5/3) = 0
x^2+4*x-5/3 = 0
x^2+4*x-5/3 = 0
DELTA = 4^2-(-5/3*1*4)
DELTA = 68/3
DELTA > 0
x = ((68/3)^(1/2)-4)/(1*2) or x = (-(68/3)^(1/2)-4)/(1*2)
x = ((68/3)^(1/2)-4)/2 or x = (-((68/3)^(1/2)+4))/2
x in { (-((68/3)^(1/2)+4))/2, ((68/3)^(1/2)-4)/2 }
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