F*D*h_2/2-(a-F*D)h_1,h_1=F*D^2(7a)^(1/3)/2-F^6,h_2=(a-F*D)D*(7a)^(1/3)+F^6

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.