help on letsimp

• Subject: help on letsimp
• From: Patapon
• Date: Fri, 30 Oct 2009 23:27:29 +0800

(%i76) matchdeclare([aa,bb],true);
(%o76) done
(%i77) let(aa*bb+aa*cc,aa*(bb+cc));
(%o77) aa*cc+aa*bb --> aa*(cc+bb)
(%i78) letsimp((1-b)*x+(1-b)*e);
(%o78) -b*x+x-b*e+e

I want to get the result of (1-b)*(x+e), how?

NOTE:
I try to transform
 (1-e)*y+(1-b)*x+(1-b)*e+b-1
to
(1-e)*y + (1-b)*(x+e-1),
factor would not help here

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