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I'm trying to find out how I can let Mathematica know what is a variable and what is a parameter when asking it to simplify an expression.

For example: if I have the following expression

\[Beta] \[CapitalOmega] ((1 - \[Gamma] y) \[Xi] \[Sigma] + (x - \[Xi]) \[CapitalOmega]) + a ((-1 + \[Gamma])^2 (y (-1 + \[Beta]) + x \[Delta]))

how to define x and y as my variables so that when I run FullSimplify I get an expression like

constant+coeff*x+coeff*y

?

Otherwise, Mathematica does a simplification that gives me:

a (-1 + \[Gamma])^2 (y (-1 + \[Beta]) +

x \[Delta]) + \[Beta] \[CapitalOmega] (x \[CapitalOmega] - \[Xi] ((-1 + y \[Gamma]) \[Sigma] + \[CapitalOmega]))

Many thanks,

Ana

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# Mathematica help - simplification

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