[ 12·(24 / 25) - (x + 8)·(7 / 25) ] / [ 12·(7 / 25) + (x + 8)·(24 / 25) ] = 3 / 4

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.