what is one basic step to reduce a combination circuit to its simplest form

Answer 1

Since this is not my area of expertise, I searched Google under the key words "reduce combination circuit" to get these possible sources:

http://books.google.com/books?id=kddgHk0P3NcC&pg=PA188&lpg=PA188&dq=reduce+combination+circuit&source=web&ots=86jA3Wjmls&sig=ZKM8IWI9zwTer_lmlQRQCz-sdbE&hl=en
http://www.allaboutcircuits.com/vol_1/chpt_7/2.html
http://www.allaboutcircuits.com/vol_1/chpt_10/1.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.