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Jen wants to take group fitness classes at a nearby gym, but needs to start by selecting a membership plan. With the first membership plan, Jen can pay $52 per month, plus $3 for each group class she attends. Alternately, she can get the second membership plan and pay $31 per month plus $4 per class. If Jen attends a certain number of classes in a month, the two membership plans end up costing the same total amount. How many classes per month is that? What is that total amount?