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### SUBSTITUTIONS IN SYMBOLIC EXPRESSIONS

Hi,

I would like to know if it is possible to substitute expressions inside some equation or expression.

Consider the following expression:

$$(r+1)\cdot(r+2)+g+a$$

Then, I would like to say that I want this same expression for $c+d = 2\cdot r + a$.

Is this possible?

Can I implement something like this in SAGE?