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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 12/11 // - 12/11
6/x-(12/11) = 0
6/x-12/11 = 0
6*x^-1 = 12/11 // : 6
x^-1 = 2/11
-1 < 0
1/(x^1) = 2/11 // * x^1
1 = 2/11*x^1 // : 2/11
11/2 = x^1
x = 11/2
x = 11/2
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