title: Unable to solve for x for an equation with independent variable in the exponent
body: <p>I am trying to help a friend in finance research. I wish to solve, for x, the equation that looks like :</p>
  <p><img src="https://i.stack.imgur.com/h1etn.jpg" alt="enter image description here" /></p>
  <p>g,h,c,p,a,b are all constants.</p>
  <p>I guess the first step would be to find it's derivative. This I did, using an online derivative calculator at <a href="http://www.derivative-calculator.net/" rel="nofollow noreferrer">http://www.derivative-calculator.net/</a>. I got this :</p>
  <p><img src="https://i.stack.imgur.com/Kyf5R.jpg" alt="enter image description here" /></p>
  <p>Further, I am trying to solve for x, assuming this is equal to zero. None of the online tools for 'solve for x' are able to do it. I have tried, Wolfram Alpha's online tool for 'solve-for-x', QuickMath, CynMath etc. All of them, 'cannot be solved'. I am looking for a solution like : x = blah-blah-blah. I have also tried the online Mathlab/Octave tools at CompileOnline/TutorialPoint. What can I do to solve for x, (preferably not having to install MathLab etc). Is there anything about these equations that render them incapable to be solved by Wolfram Alpha or such online tools for 'solve for x' ?</p>