title: Solve for integral limit
body: <p>I need to find the limit of an integral in a numerical way, knowing the result of that integral. What I need to solve is:</p>
  
  <p><a href="https://i.stack.imgur.com/URwcD.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/URwcD.gif" alt="Integral equation to solve"></a></p>
  
  <p>As you can see, that is the incomplete beta function. I know <code>a</code>, <code>b</code> and <code>c</code>. And the integral limits are from <code>0</code> to <code>x</code>. I need to find <code>x</code>.</p>