In preparation for his art exhibit, Jacob plans to create a series of paintings. He plans to paint 2 paintings on the first day, and he will increase the number of paintings he completes each day by 3 more than the previous day. If he continues this pattern for 7 days, how many paintings will he have completed in total by the end of the 7th day? Let's think step by step and output the final answer within \boxed{}.
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