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