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  • $\begingroup$ Since the new rule covers all variables,why not use the new rule directly? $\endgroup$ Commented Apr 17, 2017 at 22:30
  • $\begingroup$ @yode I don't have the new rule. I want to obtain the new rule by applying the old rule to itself. $\endgroup$ Commented Apr 17, 2017 at 22:31
  • $\begingroup$ MapAt[# //. eqn &, eqn, {All, 2}] comes to mind. $\endgroup$ Commented Apr 17, 2017 at 22:32
  • $\begingroup$ @C.E. Ahh, MapAt of course! Great! $\endgroup$ Commented Apr 17, 2017 at 22:37