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(1/3)*x^2+(1/2)*x-8 = 0
1/3*x^2+1/2*x-8 = 0
DELTA = (1/2)^2-(-8*1/3*4)
DELTA = 131/12
DELTA > 0
x = ((131/12)^(1/2)-1/2)/(1/3*2) or x = (-(131/12)^(1/2)-1/2)/(1/3*2)
x = 3/2*((131/12)^(1/2)-1/2) or x = -3/2*((131/12)^(1/2)+1/2)
x in { -3/2*((131/12)^(1/2)+1/2), 3/2*((131/12)^(1/2)-1/2) }
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