Mhnaifa can you please help?

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

Combine like terms to make a simpler expression 3z+z

Answer pls man im trying to get out of summer school