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DDD profile equation

Hello, I'm trying to assign an equation to part of a DDD profile, but I obviously am doing something wrong. 

I assigned variable D to the height dimension and variable E to the bottom dimension. I need E to be dependent on D minus 1". I tried to create an equation to represent this but I haven't been able to figure out how to get it all to work. I've looked in the help file but there aren't any good examples of how to accomplish this. Has anyone tried to do this and succeeded? 

thanks,

Kevin