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Kamberly and elizabeth are having lunch ...

Kamberly and elizabeth are having lunch at a diner.The price of kimberly 's meal is z dollars, and the price of Elizabeth's meal is $4 more than the price of Kimberly's meal. They decide to evenly share the cost of lunch, and a 10% tax is applied to the meal. Which of the following expressions represents the amount, in dollars, that each of them owes without tip?

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