How do you work this problem step by step? p-12 when p= 22

We don't know what book you are using and probably none of us has a copy if you told us the name of the book. Please post your question and someone will try to help. Please be specific and tell us exactly what you don't understand.

The book I/m using is Algebra 1 by McDougal Littell

Please post your question. We are volunteers from here to yon and we have no knowledge of where you go to school are what you are taking.