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x in (-oo:+oo)
(2/5)*x-((4/3)*x^2) = 0
(-4/3)*x^2+(2/5)*x = 0
2/5*x-4/3*x^2 = 0
DELTA = (2/5)^2-(-4/3*0*4)
DELTA = 4/25
DELTA > 0
x = ((4/25)^(1/2)-2/5)/(-4/3*2) or x = (-(4/25)^(1/2)-2/5)/(-4/3*2)
x = 0 or x = 3/10
x in { 0, 3/10 }
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