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x in (-oo:+oo)
(4/6)*x^2+5*x-x = 0
2/3*x^2+4*x = 0
DELTA = 4^2-(0*2/3*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)-4)/(2/3*2) or x = (-16^(1/2)-4)/(2/3*2)
x = 0 or x = -6
x in { -6, 0 }
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