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