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