4. Solve the following inequality, which means that the solution is set on the number axis: (6 points for each small question, *** 12 points)

1.2.2x- 1 & lt； 4x+ 13

There are two kinds of rooms in the hotel. Class A can have four guests in each room, and Class B can have three guests in each room. If Class A lives in a class of boys, one room is not satisfied. If they are all assigned to Class B rooms, there are still two people who have no place to live. It is known that the number of two rooms in this hotel is equal, so please find out the number of boys in this class.