HELP: Rearranging equation facsum



Hello,

I would ask if someone knows how to use "rearranging-equation" 
commands in maxima. I have to express this result



                                    Ca k t
(%o377)                         --------------
                                            E
                                           ---
                                           R T
                                Ca k t + %E


in terms of exp(-E/(R*T)), leading to display

                                          E
                                       - ---
                                         R T
                                Ca k %E      t
(%o378)                       ------------------
                                        E
                                     - ---
                                       R T
                              Ca k %E      t + 1


to make evident rate behaviour. Anyone has a clue?
I have tried with facsum, factorsum, but with no
success. 
Thank you for help.

Paolo