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Mar 21st, 2019
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  1. Solve[1/(1 + 10^-a) == b, a]
  2.  
  3. -Log[-((b - 1)/b)/Log[10]]
  4.  
  5. {{a -> ConditionalExpression[(2 I [Pi] C[1])/Log[10] + Log[-(b/(-1 + b))]/Log[10], C[1] [Element] Integers]}}
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