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How can I find some values for which an expression is real?

The obvious command to use is FindInstance but for some reason this command (used with a simplified but still illustrative function below) does not work: FindInstance[x + y - Log[z + a](b + c) ∈ Reals … , {x,y,z,a,b,c}] The error returned is "FindInstance::nsmet: The methods available to FindInstance are insufficient to find the requested instances or prove they do not exist." …
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