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9*x^2-((81/2)*x)-6 = 0
9*x^2+(-81/2)*x-6 = 0
9*x^2-81/2*x-6 = 0
DELTA = (-81/2)^2-(-6*4*9)
DELTA = 7425/4
DELTA > 0
x = ((7425/4)^(1/2)+81/2)/(2*9) or x = (81/2-(7425/4)^(1/2))/(2*9)
x = ((7425/4)^(1/2)+81/2)/18 or x = (81/2-(7425/4)^(1/2))/18
x in { (81/2-(7425/4)^(1/2))/18, ((7425/4)^(1/2)+81/2)/18 }
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