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

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

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