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x^2-((5*x)/3)-(8/3) = 0
x^2+(-5/3)*x-8/3 = 0
x^2-5/3*x-8/3 = 0
DELTA = (-5/3)^2-(-8/3*1*4)
DELTA = 121/9
DELTA > 0
x = ((121/9)^(1/2)+5/3)/(1*2) or x = (5/3-(121/9)^(1/2))/(1*2)
x = 8/3 or x = -1
x in { -1, 8/3 }
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