I am not sure what you are asking exactly. Is this displayed? Are there line numbers? I can't see why the first line would need a runover - even if you begin it in cell 5. If it's displayed to paragraph material, it would begin in cell 3...with a blank line before. If using poetry, it would then be 3-5...if I'm missing the reason it should start in cell 5, and you are sure that is where it should start, then the margins would be 5-7. If it's displayed to exercise material (maybe it's an excerpt?) that would explain the cell 5 🙂 and then yes, you would use 5-7 margins (but I still don't know why the first line would need a runover). Remember that displayed needs a blank line before and after.