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why does it still running?!

• To: mathgroup at smc.vnet.net
• Subject: [mg113139] why does it still running?!
• From: olfa <olfa.mraihi at yahoo.fr>
• Date: Fri, 15 Oct 2010 13:50:08 -0400 (EDT)

Hi Mathematica community,
why Mathematica still running and so can't give me a solution for this system
Reduce[
((1 - a)*x - b)/a^(i/1) == ((1 - a)*y - b)/a^(j/1) && j == 10,{y},
Backsubstitution -> True]

Thank you very much.