If "@e/a[distance=x]" is used in any command(execute,tp,etc.), it isn't working any entity/player and any distance
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@e[distance=x] will only match entities that are exactly x blocks away from where you executed the command. If you want to match all entites that are up to x blocks away, you need to use @e[distance=..x]. You can also match all entities that are at least x blocks away by using @e[distance=x..] or all entites that are between x and y blocks away by using @e[distance=x..y].
Click here for an explanation on target selectors in the Minecraft wiki.
I know that i have to use number, i wrote "x" as a variable