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constants

• To: mathgroup at smc.vnet.net
• Subject: [mg100176] constants
• From: olfa <olfa.mraihi at yahoo.fr>
• Date: Wed, 27 May 2009 04:07:12 -0400 (EDT)

Hi mathematica community
I have to Reduce[{x + a*z/(1 - d) == y + a*w/(1 - d)] I need to tell
mathematica that a and d are constants
how ?
Thanks