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