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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23 = 3/x // - 3/x
23-(3/x) = 0
23-3*x^-1 = 0
-3*x^-1 = -23 // : -3
x^-1 = 23/3
-1 < 0
1/(x^1) = 23/3 // * x^1
1 = 23/3*x^1 // : 23/3
3/23 = x^1
x = 3/23
x = 3/23
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