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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-6/13 = 8/x+1 // - 8/x+1
-(8/x)-6/13-1 = 0
-8*x^-1-6/13-1 = 0
-8*x^-1 = 19/13 // : -8
x^-1 = -19/104
-1 < 0
1/(x^1) = -19/104 // * x^1
1 = -19/104*x^1 // : -19/104
-104/19 = x^1
x = -104/19
x = -104/19
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