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