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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(1/x)-(24/5) = 0
x-x^-1-24/5 = 0
1*x^1-1*x^-1-24/5*x^0 = 0
(1*x^2-24/5*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-24/5*x^1-1*x^0) = 0
x^1
x^2+(-24/5)*x-1 = 0
x^2+(-24/5)*x-1 = 0
DELTA = (-24/5)^2-(-1*1*4)
DELTA = 676/25
DELTA > 0
x = ((676/25)^(1/2)-(-24/5))/(1*2) or x = (-(-24/5)-(676/25)^(1/2))/(1*2)
x = 5 or x = -1/5
x in { -1/5, 5}
x in { -1/5, 5 }
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