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x in (-oo:+oo)
(4/3)*x^2+(3/5)*x = 0
4/3*x^2+3/5*x = 0
DELTA = (3/5)^2-(0*4/3*4)
DELTA = 9/25
DELTA > 0
x = ((9/25)^(1/2)-3/5)/(4/3*2) or x = (-(9/25)^(1/2)-3/5)/(4/3*2)
x = 0 or x = -9/20
x in { -9/20, 0 }
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