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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19-((2*x)/x) = 6-(5/x) // - 6-(5/x)
5/x-((2*x)/x)-6+19 = 0
5/x-6-2+19 = 0
5*x^-1 = -11 // : 5
x^-1 = -11/5
-1 < 0
1/(x^1) = -11/5 // * x^1
1 = -11/5*x^1 // : -11/5
-5/11 = x^1
x = -5/11
x = -5/11
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