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(x^2)/12-((2/3)*x)-4 = 0
(x^2)/12+(-2/3)*x-4 = 0
1/12*x^2-2/3*x-4 = 0
DELTA = (-2/3)^2-(-4*1/12*4)
DELTA = 16/9
DELTA > 0
x = ((16/9)^(1/2)+2/3)/(1/12*2) or x = (2/3-(16/9)^(1/2))/(1/12*2)
x = 12 or x = -4
x in { -4, 12 }
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