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Math problem in the third grade of primary school: Does the factory have a new batch of masks for workshop employees?
We can solve this problem by listing binary linear equations:

Set the number of employees as x and the number of masks as y;

Column equation:

9x=y+ 108

7x=y-28

Solve unknown problems:

x = 68y=504

There are 68 people in the factory and 504 masks.

Check calculation:

9*68=504+ 108

7*68=504-28