Question: problem using changevar()

Whenever I use the function changevar() and press ENTER, I always get the following output, despite paying

attention to the syntax

 

example:

 

g1:=changevar(q,g,t);

 

Output:

g1:=changevar(....)

 

Ideally, I would like the output to be the following:

 

g1:=...

 

What could be the problem with my code?

 

U

 

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