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(1/4)*x^2-((1/12)*x)-(5/6) = 0
(1/4)*x^2+(-1/12)*x-5/6 = 0
1/4*x^2-1/12*x-5/6 = 0
DELTA = (-1/12)^2-(-5/6*1/4*4)
DELTA = 121/144
DELTA > 0
x = ((121/144)^(1/2)+1/12)/(1/4*2) or x = (1/12-(121/144)^(1/2))/(1/4*2)
x = 2 or x = -5/3
x in { -5/3, 2 }
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