a box of pencils cost the same as 11 erasers and 7 pencils. a box of

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a box of pencils cost the same as 11 erasers and 7 pencils. a box of erasers cost the same as 6 erasers and a pencil. a box of empty boxes and an erasers cost the same as a pencil. given that boxes cost a penny and each of the boxes contain an equal number of objects, how much does it costs to buy a box of erasers combined?

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