Maddie does not have any pretzels.
Zach gives abbey 8 pretzels. then he splits half the pretzels he has left with Maddie. Zach let's p represent the number of pretzels he starts with. He finds that the number of pretzels maddie has is 1/2 the difference of p and 8.
write an expression to represent the number of pretzels that maddie has.