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x^2-((7/3)*x)-12 = 0
x^2+(-7/3)*x-12 = 0
x^2-7/3*x-12 = 0
DELTA = (-7/3)^2-(-12*1*4)
DELTA = 481/9
DELTA > 0
x = ((481/9)^(1/2)+7/3)/(1*2) or x = (7/3-(481/9)^(1/2))/(1*2)
x = ((481/9)^(1/2)+7/3)/2 or x = (7/3-(481/9)^(1/2))/2
x in { (7/3-(481/9)^(1/2))/2, ((481/9)^(1/2)+7/3)/2 }
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