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x in (-oo:+oo)
(1/15)*x^2+(3/5)*x+4/3 = 0
1/15*x^2+3/5*x+4/3 = 0
DELTA = (3/5)^2-(1/15*4/3*4)
DELTA = 1/225
DELTA > 0
x = ((1/225)^(1/2)-3/5)/(1/15*2) or x = (-(1/225)^(1/2)-3/5)/(1/15*2)
x = -4 or x = -5
x in { -5, -4 }
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