elisp - In Emacs can you evaluate an Emacs Lisp expression and replace it with the result? -

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For example if I have the text: 

  Sum of items (+ 1 2 3)

I want to move at the end of the line, evaluate the expression and replace it with the result, so that it can read: 

  
 
 
 Cu Cx Ce  
   In the / kbd> buffer, the preceding parentheses will include the value of the expression. You can do this, then manually back up and delete the original expression. If this is a lot of work, then here is a command that evaluates the preceding expression and changes it with its value:  
  (defun replace-last-sexp () (interactive) (Two (value (eval (predecessor-sexp)) (kill-sex-1) (insert (format "% S" value)))

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