Sorry I must be a bit dense on this. Something is not clicking.
If you divide the first D from the left side.
You are left with 2L=D(6Q/D)+5
Is that correct?
Now if I get rid of the D on the right side. would it not get rid of the D? then there is no D left??Because you have to divide out it all out of the right side.
I am lost, sorry.