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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x = 24/x+1/5 // - 24/x+1/5
x-(24/x)-(1/5) = 0
x-24*x^-1-1/5 = 0
1*x^1-24*x^-1-1/5*x^0 = 0
(1*x^2-1/5*x^1-24*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1/5*x^1-24*x^0) = 0
x^1
x^2+(-1/5)*x-24 = 0
x^2+(-1/5)*x-24 = 0
DELTA = (-1/5)^2-(-24*1*4)
DELTA = 2401/25
DELTA > 0
x = ((2401/25)^(1/2)-(-1/5))/(1*2) or x = (-(-1/5)-(2401/25)^(1/2))/(1*2)
x = 5 or x = -24/5
x in { -24/5, 5}
x in { -24/5, 5 }
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