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.
x = 2 (1 - (10*39/(39+510) -x * 1)% 2F-1.0)% 5E2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random