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x in (-oo:+oo)
(1/12)*x^2-((1/3)*x) = 16 // - 16
(1/12)*x^2-((1/3)*x)-16 = 0
(1/12)*x^2+(-1/3)*x-16 = 0
1/12*x^2-1/3*x-16 = 0
DELTA = (-1/3)^2-(-16*1/12*4)
DELTA = 49/9
DELTA > 0
x = ((49/9)^(1/2)+1/3)/(1/12*2) or x = (1/3-(49/9)^(1/2))/(1/12*2)
x = 16 or x = -12
x in { -12, 16 }
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