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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x-5 = 11 // - 11
11/x-11-5 = 0
11*x^-1 = 16 // : 11
x^-1 = 16/11
-1 < 0
1/(x^1) = 16/11 // * x^1
1 = 16/11*x^1 // : 16/11
11/16 = x^1
x = 11/16
x = 11/16
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