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