You can
put this solution on YOUR website!You look at every single part of the fraction individually, eg

becomes
you look at the signs --> do that
you look at the coefficients --> do that
you look at the w terms --> do that
you look at the x terms --> do that
you look at the y terms --> do that
you look at the z terms --> do that
then that is your answer. This shows you most if not all of the possibilities. If you have a specific question, then ask it :-)
jon.