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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 25/11 // - 25/11
5/x-(25/11) = 0
5/x-25/11 = 0
5*x^-1 = 25/11 // : 5
x^-1 = 5/11
-1 < 0
1/(x^1) = 5/11 // * x^1
1 = 5/11*x^1 // : 5/11
11/5 = x^1
x = 11/5
x = 11/5
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