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(5/3)*x^2-x = 4/3 // - 4/3
(5/3)*x^2-x-(4/3) = 0
(5/3)*x^2-x-4/3 = 0
5/3*x^2-x-4/3 = 0
DELTA = (-1)^2-(-4/3*5/3*4)
DELTA = 89/9
DELTA > 0
x = ((89/9)^(1/2)+1)/(5/3*2) or x = (1-(89/9)^(1/2))/(5/3*2)
x = 3/10*((89/9)^(1/2)+1) or x = 3/10*(1-(89/9)^(1/2))
x in { 3/10*(1-(89/9)^(1/2)), 3/10*((89/9)^(1/2)+1) }
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