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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-5 = 8/x // - 8/x
6/x-(8/x)-5 = 0
6/x-8*x^-1-5 = 0
-2*x^-1 = 5 // : -2
x^-1 = -5/2
-1 < 0
1/(x^1) = -5/2 // * x^1
1 = -5/2*x^1 // : -5/2
-2/5 = x^1
x = -2/5
x = -2/5
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