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x^2-(11*x)-((2/3)*x)-15 = 0
x^2-11*x+(-2/3)*x-15 = 0
x^2-35/3*x-15 = 0
DELTA = (-35/3)^2-(-15*1*4)
DELTA = 1765/9
DELTA > 0
x = ((1765/9)^(1/2)+35/3)/(1*2) or x = (35/3-(1765/9)^(1/2))/(1*2)
x = ((1765/9)^(1/2)+35/3)/2 or x = (35/3-(1765/9)^(1/2))/2
x in { (35/3-(1765/9)^(1/2))/2, ((1765/9)^(1/2)+35/3)/2 }
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