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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x-((2*x)/3) = 0
(-2/3)*x+24/x = 0
24*x^-1-2/3*x^1 = 0
(24*x^0-2/3*x^2)/(x^1) = 0 // * x^2
x^1*(24*x^0-2/3*x^2) = 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 = (64^(1/2)+0)/(2*(-2/3)) or x = (0-64^(1/2))/(2*(-2/3))
x = -6 or x = 6
x in { -6, 6}
x in { -6, 6 }
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