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Help using Compile with Solve

I want to create a compiled function that uses Solve, like this


CompiledFunction[{x, y}, Solve[x + y == z, z], -CompiledCode-]


   Expression z should be a machine-size real number.
   External evaluation error at instruction 5; proceeding with
     uncompiled evaluation.

{{z -> 2}}

As you can see, this doesn't work as a compiled function.  
It seems like I need to tell Compile that z is also real, but 
I'm not sure how to do that.

Thanks, Bill

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