And as usual it's a 7-on-4 fight. I refer you once again to the special section in the 5e rules which states that larger encounters need to have a modifier added to their difficulty rating.
https://www.dndbeyond.com/sources/basic-rules/building-combat-encountersDon't worry though, they balanced this encounter by also giving the enemies the capacity to paralyze you and steal your action for the combat round. *slaps forehead*