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