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(4*x^2)/3-((31*x^1)/3)-8 = 0
(4*x^2)/3+(-31/3)*x-8 = 0
4/3*x^2-31/3*x-8 = 0
DELTA = (-31/3)^2-(-8*4/3*4)
DELTA = 1345/9
DELTA > 0
x = ((1345/9)^(1/2)+31/3)/(4/3*2) or x = (31/3-(1345/9)^(1/2))/(4/3*2)
x = 3/8*((1345/9)^(1/2)+31/3) or x = 3/8*(31/3-(1345/9)^(1/2))
x in { 3/8*(31/3-(1345/9)^(1/2)), 3/8*((1345/9)^(1/2)+31/3) }
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