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x^2-((2/3)*x)-(23/16) = 0
x^2+(-2/3)*x-23/16 = 0
x^2-2/3*x-23/16 = 0
DELTA = (-2/3)^2-(-23/16*1*4)
DELTA = 223/36
DELTA > 0
x = ((223/36)^(1/2)+2/3)/(1*2) or x = (2/3-(223/36)^(1/2))/(1*2)
x = ((223/36)^(1/2)+2/3)/2 or x = (2/3-(223/36)^(1/2))/2
x in { (2/3-(223/36)^(1/2))/2, ((223/36)^(1/2)+2/3)/2 }
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