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x in (-oo:+oo)
(48/3)*x^2-(24*x) = 0
(48/3)*x^2-24*x = 0
16*x^2-24*x = 0
DELTA = (-24)^2-(0*4*16)
DELTA = 576
DELTA > 0
x = (576^(1/2)+24)/(2*16) or x = (24-576^(1/2))/(2*16)
x = 3/2 or x = 0
x in { 0, 3/2 }
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