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How can i change variables symbols throughout the entire code without having to change it one by one. So for example A=20 and then 2*A=40; should change to B=20 and 2*B=40.

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    $\begingroup$ tried the front end find/replace menu? $\endgroup$ – george2079 Dec 14 '17 at 0:57
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    $\begingroup$ Make sure to use the "whole word" option in the front end find/replace menu. $\endgroup$ – jjc385 Dec 14 '17 at 1:21
  • $\begingroup$ Use ReplaceAll: expr /. A -> B. $\endgroup$ – march Dec 14 '17 at 5:31

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