What are the steps to simplify

Question

Please walk me through the steps to simplify 21 - (32y + 9 - z)

Answer 1

21 - (32y + 9 - z ) =

 

21 - 32y - 9 + z   =        <---- Distributes the -1 over the quantity; all of the signs change

 

12 - 32y + z          <--- combines like terms