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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/4)/1 = 26/x // - 26/x
(1/4)/1-(26/x) = 0
1/4-26*x^-1 = 0
-26*x^-1 = -1/4 // : -26
x^-1 = 1/104
-1 < 0
1/(x^1) = 1/104 // * x^1
1 = 1/104*x^1 // : 1/104
104 = x^1
x = 104
x = 104
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