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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X = (11/17)*(11/x) // - (11/17)*(11/x)
X-((11/17)*(11/x)) = 0
X+(-121/17)*x^-1 = 0
-121/17*x^-1 = -X // : -121/17
x^-1 = 17/121*X
-1 < 0
1/(x^1) = 17/121*X // * x^1
1 = 17/121*X*x^1 // : 17/121*X
121/17*X^-1 = x^1
x = 121/17*X^-1
x = 121/17*X^-1
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