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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x-5 = 4 // - 4
11/x-5-4 = 0
11*x^-1 = 9 // : 11
x^-1 = 9/11
-1 < 0
1/(x^1) = 9/11 // * x^1
1 = 9/11*x^1 // : 9/11
11/9 = x^1
x = 11/9
x = 11/9
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