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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 26/53 // - 26/53
5/x-(26/53) = 0
5/x-26/53 = 0
5*x^-1 = 26/53 // : 5
x^-1 = 26/265
-1 < 0
1/(x^1) = 26/265 // * x^1
1 = 26/265*x^1 // : 26/265
265/26 = x^1
x = 265/26
x = 265/26
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