Zach and Reid have summer jobs selling newspaper subscriptions door-to-door, but their compensation plans are different. Zach earns a base wage of $13 per hour, as well as $1 for
every subscription that he sells. Reid gets $4 per subscription sold, in addition to a base wage
of $4 per hour. If they each sell a certain number of subscriptions in an hour, they will end up
earning the same amount. How many subscriptions would that be? How much would each
one earn?