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x in (-oo:+oo)
(1/3)*x^2+(1/3)*x-4 = 0
1/3*x^2+1/3*x-4 = 0
DELTA = (1/3)^2-(-4*1/3*4)
DELTA = 49/9
DELTA > 0
x = ((49/9)^(1/2)-1/3)/(1/3*2) or x = (-(49/9)^(1/2)-1/3)/(1/3*2)
x = 3 or x = -4
x in { -4, 3 }
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