There are 450 books on a shelf . Of these, 6x of the books were taken down to be recycled as they were too old, and 12x were lent out. New books, totalling 4y were added to the shelf. Write an expression for the number of books now on the shelf.

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450 - 18X + 4Y.
So you basically just plus 12 and 6 since they can be grouped as one (X).