Create is more/less than ____, before/after property option for lists

I'm trying to run a report off a list but I'm not able to set it up like I want to. I have an option for "is more/less than" and also "is before/after property," but I'm not able to combine these properties. 


I'm trying to see if a date property is 7 days after another date property, but setting them up as different list options isn't going to work in this case.  

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