Report Formula

I have found posts on this, but they don't address what I'm looking for, which is a report formula. 
I only want to see the last entry on a notes field that is already there and has multiple entries. I used the formulas in the posts I found, in the reports formula, and they didn't work. 
I can't set up a new text formula field so I'm looking for anything that will work in a report formula.

Thank you

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Steven Pearson
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