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(1/3)*x^2-((1/6)*x)+5/6 = 0
(1/3)*x^2+(-1/6)*x+5/6 = 0
1/3*x^2-1/6*x+5/6 = 0
DELTA = (-1/6)^2-(1/3*5/6*4)
DELTA = -13/12
DELTA < 0
x belongs to the empty set
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