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.
solve \frac{t+u}{t+u+4} = \frac{5t-7}{7t-5} for u
solve \frac{t+u}{t+u+4} = \frac{5t-7}{7t-5} for u
Natural Language
Math Input
Extended Keyboard
