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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x-(6*x) = 0
24/x-6*x = 0
24*x^-1-6*x^1 = 0
(24*x^0-6*x^2)/(x^1) = 0 // * x^2
x^1*(24*x^0-6*x^2) = 0
x^1
24-6*x^2 = 0
24-6*x^2 = 0
DELTA = 0^2-(-6*4*24)
DELTA = 576
DELTA > 0
x = (576^(1/2)+0)/(-6*2) or x = (0-576^(1/2))/(-6*2)
x = -2 or x = 2
x in { -2, 2}
x in { -2, 2 }
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