Claire was in charge of passing out free balloons to all the children at the fair.  She started with 50 balloons.  While passing 1 balloon to a little girl, 12 balloons floated away.  Over the next thirty minutes, she gave 9 more away and grabbed the last 11 from her coworker.  How many balloons does Claire have?
Please reason step by step, and put your final answer within \boxed{}.
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