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(2*x^2)/3-((x^1)/3)-28 = 0
(2*x^2)/3-(x/3)-28 = 0
2/3*x^2-1/3*x-28 = 0
DELTA = (-1/3)^2-(-28*2/3*4)
DELTA = 673/9
DELTA > 0
x = ((673/9)^(1/2)+1/3)/(2/3*2) or x = (1/3-(673/9)^(1/2))/(2/3*2)
x = 3/4*((673/9)^(1/2)+1/3) or x = 3/4*(1/3-(673/9)^(1/2))
x in { 3/4*(1/3-(673/9)^(1/2)), 3/4*((673/9)^(1/2)+1/3) }
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