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John and Ariana brought school supplies. John spent $9.80 on 4 notebooks and 7 pens. Ariana...

John and Ariana brought school supplies. John spent $9.80 on 4 notebooks and 7 pens. Ariana spent $7.00 on 3 notebooks and 4 pens. What is the cost of 1 notebook and what is the cost of 1 pen?

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