Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
inverse of (3e^x-9)/(19e^x+9)
inverse of (3e^x-9)/(19e^x+9)
Natural Language
Math Input
Extended Keyboard