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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x+11/19 = 0
9*x^-1 = -11/19 // : 9
x^-1 = -11/171
-1 < 0
1/(x^1) = -11/171 // * x^1
1 = -11/171*x^1 // : -11/171
-171/11 = x^1
x = -171/11
x = -171/11
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