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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = (5/1)/23 // - (5/1)/23
9/x-((5/1)/23) = 0
9/x-5/23 = 0
9*x^-1 = 5/23 // : 9
x^-1 = 5/207
-1 < 0
1/(x^1) = 5/207 // * x^1
1 = 5/207*x^1 // : 5/207
207/5 = x^1
x = 207/5
x = 207/5
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