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(9*x^1)/3-((10*x^2)/3)+1 = 0
(-10/3)*x^2+(9*x)/3+1 = 0
3*x-10/3*x^2+1 = 0
DELTA = 3^2-(-10/3*1*4)
DELTA = 67/3
DELTA > 0
x = ((67/3)^(1/2)-3)/(-10/3*2) or x = (-(67/3)^(1/2)-3)/(-10/3*2)
x = -3/20*((67/3)^(1/2)-3) or x = 3/20*((67/3)^(1/2)+3)
x in { -3/20*((67/3)^(1/2)-3), 3/20*((67/3)^(1/2)+3) }
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