The manager of a summer camp has 14 baseballs and 23 tennis balls. the manager buys some boxes of baseballs with 12 baseballs to a box and an equal number of boxes of tennis balls with 16 tennis balls to a box. Write an expression to represent the total number of balls. Use the expression that you found above to find the total number of baseballs and tennis balls if the manager bought 9 boxes of each type.