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.
1/|4·x + 2| + 1/|4·x - 13| ≤ 1/4
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random