Asports stadium has 1 seats, divided into box seats, lower-deck seats, and upper-devk seats. box seats sell for 10 dollars, lower-deck seats sell for 8 dollars, and upper-deck seats sell for 5 dollars. if all the seats are sold, the total revenue for a game is 7 dollars. the stadium has 4 times as many upper* deckseats as box seats. how many lower-deck seats are in the stadium?