Elsa started the day with 40 marbles.  At breakfast, she lost 3 marbles while playing.  At lunchtime, she gave her best friend Susie 5 marbles.  In the afternoon, Elsa's mom bought her a new bag with 12 marbles.  Susie came back and gave Elsa twice as many marbles as she received at lunch.  How many marbles did Elsa end the day with?
Please reason step by step, and put your final answer within \boxed{}.
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