In order to isolate 'x', we can use the number 'e' to cancel the natural log. The 'e' will cancel the natural log because they are inverse to each other:
Well just subtract 20 by 5 and get 15. Divide that which is the remaining amount of money after the shoes by 2.25 and get 6.6 with the 6's going on forever. Since he can't play 6.6 games you will make it reasonable and he will only be able to play 6 games.