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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/3 = -24/x // + -24/x
(2*x)/3-(-24/x) = 0
(2*x)/3+24*x^-1 = 0
2/3*x^1+24*x^-1 = 0
(2/3*x^2+24*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2+24*x^0) = 0
x^1
(2/3)*x^2+24 = 0
(2/3)*x^2+24 = 0
DELTA = 0^2-(4*24*(2/3))
DELTA = -64
DELTA < 0
x in { }
x belongs to the empty set
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