Question: How to define an expression using '%'?

I selected an element from a 'solve'command that depends on 3 variables (let's say a, b and c), and I want to make it a function f without rewriting everything.

Can I simply type 'f:=(%)', or is there another command to do it? Yet, do I need to write the dependence on the 3 variables I mentioned?

Thank you for you time!

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