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X in (-oo:+oo)
(1/5)*X^2+(2/3)*X = 0
1/5*X^2+2/3*X = 0
DELTA = (2/3)^2-(0*1/5*4)
DELTA = 4/9
DELTA > 0
X = ((4/9)^(1/2)-2/3)/(1/5*2) or X = (-(4/9)^(1/2)-2/3)/(1/5*2)
X = 0 or X = -10/3
X in { -10/3, 0 }
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