CPM Homework Help : GB8I Problem 11-84

Shu Min currently has 1980 digital songs, and downloads $30$ more songs each month. Her older brother Wei currently has $2590$ songs, but he only downloads $20$ more songs each month. The computer they share can only hold $5000$ songs. After how many months will their computer be full?

Hint:

Let $x$ represent the number of months.
Set up an expression for Shu Min and Wei.

More Help:

Shu Min: $1980 + 30x$ will represent the number of songs she will have after $x$ months.
What will her brother's expression be?