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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8 = 5/x-8 // - 5/x-8
8-(5/x)+8 = 0
8-5*x^-1+8 = 0
-5*x^-1 = -16 // : -5
x^-1 = 16/5
-1 < 0
1/(x^1) = 16/5 // * x^1
1 = 16/5*x^1 // : 16/5
5/16 = x^1
x = 5/16
x = 5/16
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