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x in (-oo:+oo)
(1/3)*x^2+2*x-144 = 0
1/3*x^2+2*x-144 = 0
DELTA = 2^2-(-144*1/3*4)
DELTA = 196
DELTA > 0
x = (196^(1/2)-2)/(1/3*2) or x = (-196^(1/2)-2)/(1/3*2)
x = 18 or x = -24
x in { -24, 18 }
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