PostgreSQL: add an interval of days represented by a variable to a date

We know that if you want to add 4 days to a date, you do the following.

      <your date> + interval '4 days'

However, if you have

      int x = 4;
   
It will not work by:

      <your date> + interval 'x days'

The way to make it work is:

      <your date> + x * (interval '1 day')

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