Answer :

sqdancefan
You have not given an equation.

If we make it an equation, then we can solve for x.
  a = 5*ln(x +8)
  a/5 = ln(x +8) . . . . . . . divide by 5
  e^(a/5) = x +8 . . . . . . take the antilog
  e^(a/5) -8 = x . . . . . . . subtract 8

If your expression is equal to "a", then x is ...
  x = e^(a/5) -8

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