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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x-5 = 9/x // - 9/x
24/x-(9/x)-5 = 0
24/x-9*x^-1-5 = 0
15*x^-1 = 5 // : 15
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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