IF THEN formulas for status balls

I am trying to use an IF THEN formula to show status balls. I have a "due date" column and a completion column. If the date in the completion column is more than 7 days later than the date in the due date column, I'd like the status ball to be red. If the date in the completion column is within 7 days of or before the date in the due date column, I would the status ball to be green. Below is the formula I have tried without success. 

=IF(([Laundry Completion Date]:[Laundry Completion Date]) > ([Start Date]:[Start Date]); "red"; IF(([Start Date]:[Start Date]) > 7; "green"; IF([Start Date]:[Start Date) < 7))

 

 

Smartsheet IF THEN to measure status.PNG

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