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