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((2*x)/2)*x-((11/2)*x)-11-11 = x-(8/3) // - x-(8/3)
((2*x)/2)*x-((11/2)*x)-x+8/3-11-11 = 0
((2*x)/2)*x+(-11/2)*x-x+8/3-11-11 = 0
x^2-13/2*x-58/3 = 0
DELTA = (-13/2)^2-(-58/3*1*4)
DELTA = 1435/12
DELTA > 0
x = ((1435/12)^(1/2)+13/2)/(1*2) or x = (13/2-(1435/12)^(1/2))/(1*2)
x = ((1435/12)^(1/2)+13/2)/2 or x = (13/2-(1435/12)^(1/2))/2
x in { (13/2-(1435/12)^(1/2))/2, ((1435/12)^(1/2)+13/2)/2 }
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