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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(19/x)-11 = 0
X-19*x^-1-11 = 0
-19*x^-1 = -(X-11) // : -19
x^-1 = (11-X)/(-19)
-1 < 0
1/(x^1) = (11-X)/(-19) // * x^1
1 = x^1*((11-X)/(-19)) // : (11-X)/(-19)
-19*(11-X)^-1 = x^1
x = -19*(11-X)^-1
x = -19*(11-X)^-1
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