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x in (-oo:+oo)
(4*x^2)/3-(2*x) <= 0
(4*x^2)/3-2*x <= 0
4/3*x^2-2*x <= 0
DELTA = (-2)^2-(0*4/3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2)/(4/3*2) or x = (2-4^(1/2))/(4/3*2)
x = 3/2 or x = 0
a = 4/3
a > 0
x in <0:3/2>
x in <0:3/2>
<0:3/2>
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