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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 46/x // - 46/x
2-(46/x) = 0
2-46*x^-1 = 0
-46*x^-1 = -2 // : -46
x^-1 = 1/23
-1 < 0
1/(x^1) = 1/23 // * x^1
1 = 1/23*x^1 // : 1/23
23 = x^1
x = 23
x = 23
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