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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6 = 26/x // - 26/x
6-(26/x) = 0
6-26*x^-1 = 0
-26*x^-1 = -6 // : -26
x^-1 = 3/13
-1 < 0
1/(x^1) = 3/13 // * x^1
1 = 3/13*x^1 // : 3/13
13/3 = x^1
x = 13/3
x = 13/3
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