Hi All.
I've been reading in a book about how to transform formulae but can't really make any sense of it. It just shows examples and doesn't really explain. I've been searching the web too for information on this but not really having any luck. Here's one example from the book:

Code:
Transform the forumla

          8d^2
L = l + ------
             3l

into one which expresses d in terms of the other quantities.
It shows how it's done but doesn't supply any rules which I can follow when transforming a formula.

If anybody has information about this or can just direct me to a web site with a decent explanation I'd be very grateful.

Thanks a lot.