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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11 = 6/x // - 6/x
11-(6/x) = 0
11-6*x^-1 = 0
-6*x^-1 = -11 // : -6
x^-1 = 11/6
-1 < 0
1/(x^1) = 11/6 // * x^1
1 = 11/6*x^1 // : 11/6
6/11 = x^1
x = 6/11
x = 6/11
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