Question: Re-Substituting an Expression

Hi guys,

I'm wondering whether it's possible to reverse my "substitution" in order to gain a nicer looking form:

In this example, I'd like to get the last "subs" statement without having to define a new variable "g_new" but instead, maple shall use the old name, and do the "resubstituion" automatically.

I hope someone can help. I'm also happy to get other advice, regarding my problem. Thanks!

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