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Replacement question


I apologize for this very basic question.  I understand how to use /. 
{} to replace a  variable with a more complex expression, e.g., x-> 
y+z.  Can one move in the opposite direction to replace all 
occurrences of y+z with x?   myExpression/.{y+z->x} does not seem to 
work.

Thank you for your help,
Brian



-- 
*********************************************************************
Brian Beckage
Department of Plant Biology
University of Vermont
Marsh Life Science Building
Burlington, VT 05405
*********************************************************************


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