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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-8 = 6 // - 6
5/x-8-6 = 0
5*x^-1 = 14 // : 5
x^-1 = 14/5
-1 < 0
1/(x^1) = 14/5 // * x^1
1 = 14/5*x^1 // : 14/5
5/14 = x^1
x = 5/14
x = 5/14
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