Dividing through in fractions



Hi!

This is probably simple to solve, but I can't for the life of me work
out how: I've got a fraction, say:

a*%e^x/(b*%e^y + d*%e^x)

and I'd much prefer

a/(b*%e^(y-x) + d)

because it's simpler. (These aren't the actual formulae but they're of
the correct form)

Is there a function with which I can "divide through" by exp(x)? Also,
is it easily callable by format(), which I've recently started using? If
not, is there a method list members favour for doing "custom
simplification" of expressions like this - i.e. simplifying stuff
because you know more than maxima about the formula, e.g. getting
dimensions to cancel etc. ?

Thanks for any help (no hurry - this was near the end of the
computation so I did it on paper!)

Rupert
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 307 bytes
Desc: not available
Url : http://www.math.utexas.edu/pipermail/maxima/attachments/20070906/2d13df13/attachment.pgp