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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/7 = 11/x // - 11/x
6/7-(11/x) = 0
6/7-11*x^-1 = 0
-11*x^-1 = -6/7 // : -11
x^-1 = 6/77
-1 < 0
1/(x^1) = 6/77 // * x^1
1 = 6/77*x^1 // : 6/77
77/6 = x^1
x = 77/6
x = 77/6
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