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x in (-oo:+oo)
(x/3)*x+(8/4)*x = 0
1/3*x^2+2*x = 0
DELTA = 2^2-(0*1/3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)-2)/(1/3*2) or x = (-4^(1/2)-2)/(1/3*2)
x = 0 or x = -6
x in { -6, 0 }
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