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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/11 = -19/x // + -19/x
9/11-(-19/x) = 0
19*x^-1+9/11 = 0
19*x^-1 = -9/11 // : 19
x^-1 = -9/209
-1 < 0
1/(x^1) = -9/209 // * x^1
1 = -9/209*x^1 // : -9/209
-209/9 = x^1
x = -209/9
x = -209/9
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