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