In a music club with 15 members, 7 people played the piano, 11 people played the guitar, and 2 people didn't play either of these two instruments. How many club members played both the piano and the guitar?
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In a music club with 15 members, 7 people played the piano, 11 people played the guitar, and 2 people didn't play either of these two instruments. How many club members played both the piano and the guitar?
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