How to factor out favored variables out of an equation?



Hi List,

I'm on my way to go the first steps with Maxima. I solved a Matrix equation 
succesfully but fail in the effort to rearrange the result. One of the  
equations of the result is:

u12: - ((((T23 + T21) T34 + (T22 - T24) T33 + (- T23 - T21) T32
 + (T22 - T24) T31) u22 + (- p22 T23 - p22 T21) T44 + (p22 T24 - p22 T22) T43
 + (p22 T23 + p22 T21) T42 + (p22 T24 - p22 T22) T41) Zo
 + (T22 T34 - T24 T32) u22 - p22 T22 T44 + p22 T24 T42)/DENOM


I know, that I could convert the equation to something like:

u12: A * p22 + B * u22

and I'm looking for the values of A and B; It would be very helpful if I could 
tell Maxima to factor out u22 and p22 instead of e.g. Zo as it has done it. 
Is there any way to do so?

I would be very grateful for any help.
Gerhard

BTW: I tried to find it in the Maxima (Reference) Manual and the Maxima Book 
without success. 

-- 
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Gerhard Zintel               Gerhard.Zintelmrs-thomas.de
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