Question
At a shop, Alice paid $21 for 6 items: 2 staplers and 4 pens. The total cost of 2 staplers is $7 more than the total cost of 4 pens. How much did 1 stapler cost?
4 m

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At a shop, Alice paid $21 for 6 items: 2 staplers and 4 pens. The total cost of 2 staplers is $7 more than the total cost of 4 pens. How much did 1 stapler cost?