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