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