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