This is stated oddly: "up to $7,500 to a combination of an IRA AND an employee 403-B state pension"

The IRA is an individual retirement account. The 403B is an employer-provided provision. So, they are not combined like that.

For instance, here is a great article for Roth + 403b:

https://www.investopedia.com/ask/answers/101314/what-are-advantages-and-disadvantages-getting-403b-v...

You'll find similar articles that compare and contrast and tell you when something is combined with something else (such as all employer plans would share one limit).