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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
52 = 23/x // - 23/x
52-(23/x) = 0
52-23*x^-1 = 0
-23*x^-1 = -52 // : -23
x^-1 = 52/23
-1 < 0
1/(x^1) = 52/23 // * x^1
1 = 52/23*x^1 // : 52/23
23/52 = x^1
x = 23/52
x = 23/52
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