solve x * n * 14*h = 1, x * (n + 4) * 10*(h+1) = 1, x * (n + 4 + 6) * 7*(h+1+1) = 1

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.