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OpenStudy (anonymous):
Joy and Cullen put some money into their money boxes every week. The amount of money (y), in dollars, in their money boxes after a certain amount of time (x), in weeks, is shown by the equations below: Joy: y = 30x + 20 Cullen: y = 20x + 90 After how many weeks will Joy and Cullen have the same amount of money in their money boxes, and what is that amount?
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