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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(24/x) = -2 // + 2
x-(24/x)+2 = 0
x-24*x^-1+2 = 0
1*x^1-24*x^-1+2*x^0 = 0
(1*x^2+2*x^1-24*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+2*x^1-24*x^0) = 0
x^1
x^2+2*x-24 = 0
x^2+2*x-24 = 0
DELTA = 2^2-(-24*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)-2)/(1*2) or x = (-100^(1/2)-2)/(1*2)
x = 4 or x = -6
x in { -6, 4}
x in { -6, 4 }
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