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a in (-oo:+oo)
12*a^2-((3/6)*a)-3 = 0
12*a^2+(-1/2)*a-3 = 0
12*a^2-1/2*a-3 = 0
DELTA = (-1/2)^2-(-3*4*12)
DELTA = 577/4
DELTA > 0
a = ((577/4)^(1/2)+1/2)/(2*12) or a = (1/2-(577/4)^(1/2))/(2*12)
a = ((577/4)^(1/2)+1/2)/24 or a = (1/2-(577/4)^(1/2))/24
a in { (1/2-(577/4)^(1/2))/24, ((577/4)^(1/2)+1/2)/24 }
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