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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(24/x)-5 = 0
x-24*x^-1-5 = 0
1*x^1-24*x^-1-5*x^0 = 0
(1*x^2-5*x^1-24*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-5*x^1-24*x^0) = 0
x^1
x^2-5*x-24 = 0
x^2-5*x-24 = 0
DELTA = (-5)^2-(-24*1*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)+5)/(1*2) or x = (5-121^(1/2))/(1*2)
x = 8 or x = -3
x in { -3, 8}
x in { -3, 8 }
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