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Substitute variable name for value (reverse of simplification)

• To: mathgroup at smc.vnet.net
• Subject: [mg128076] Substitute variable name for value (reverse of simplification)
• From: mr.hagak at gmail.com
• Date: Fri, 14 Sep 2012 00:21:55 -0400 (EDT)
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• Delivered-to: l-mathgroup@wolfram.com
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I need this to happen:
var1 = 3*a
var2 = 189*a^3
output = 7*var1^3

I can do it in very simple and specific equations doing something like

substituteName2[var_,exp_] := Module[ {},
	Solve[p==exp&&"test"==var,{p},{a}]
];
test=3*a;
substituteName2[test,7*test^3]

But i need a WAY more general form of that...any ideas?

• Follow-Ups:
  • Re: Substitute variable name for value (reverse of simplification)
    • From: Bob Hanlon <hanlonr357@gmail.com>