Rearrange Equations: Making J the Subject - Need Help

[peter_pan]

SO here is the problem

I am wondering how to make J the subject ?

I have tried making J/2 and 4a/3 into a single fraction but so far nothing.I am doing something wrong somewhere.


Any suggestions ?

 

[Mark44]

Here it is so I can see it better:
$$V = \frac{\frac{J}{2} + \frac{4a}{3}}{L}$$

Multiply both sides by L.
Subtract 4a/3 from both sides.
Multiply both sides by 2.