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6*x^2-((18/4)*x^2)+23*x+36*x+81 = 0
6*x^2+(-9/2)*x^2+23*x+36*x+81 = 0
3/2*x^2+59*x+81 = 0
DELTA = 59^2-(3/2*4*81)
DELTA = 2995
DELTA > 0
x = (2995^(1/2)-59)/(3/2*2) or x = (-2995^(1/2)-59)/(3/2*2)
x = (2995^(1/2)-59)/3 or x = (-(2995^(1/2)+59))/3
x in { (-(2995^(1/2)+59))/3, (2995^(1/2)-59)/3 }
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