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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-24/x = 9 // - 9
5-24/x-9 = 0
-24*x^-1 = 4 // : -24
x^-1 = -1/6
-1 < 0
1/(x^1) = -1/6 // * x^1
1 = -1/6*x^1 // : -1/6
-6 = x^1
x = -6
x = -6
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