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x^2-((1/3)*x)+1/36 = 0
x^2+(-1/3)*x+1/36 = 0
x^2-1/3*x+1/36 = 0
DELTA = (-1/3)^2-(1/36*1*4)
DELTA = 0
x = 1/3/(1*2)
x = 1/6 or x = 1/6
x in { 1/6, 1/6 }
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