The weekly rentals for a newly released dvd of an animated film at a local video store decreased each week. At the same time, the weekly rentals for a newly released dvd of a horror film increased each week. Models that approximate the weekly rentals R for each dvd are

R=380-40x Animated film

R=20+20x Horror film

when x represents the number of weeks each dvd was in the store, with x=1 corresponding to the first week. After how many weeks will be the rentals for the two movies be equal.