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x in (-oo:+oo)
6*x^2-((12/3)*x)-4 = 2*x // - 2*x
6*x^2-((12/3)*x)-(2*x)-4 = 0
6*x^2-4*x-2*x-4 = 0
6*x^2-6*x-4 = 0
DELTA = (-6)^2-(-4*4*6)
DELTA = 132
DELTA > 0
x = (132^(1/2)+6)/(2*6) or x = (6-132^(1/2))/(2*6)
x = (2*33^(1/2)+6)/12 or x = (6-2*33^(1/2))/12
x in { (6-2*33^(1/2))/12, (2*33^(1/2)+6)/12 }
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