In a party, There are 10 people with white shirts and 8 people with red shirts; 4

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In a party,

  • There are 10 people with white shirts and 8 people with red shirts;
  • 4 people have black shoes and white shirts;
  • 3 people have black shoes and red shirts; 
  • The total number of people with white or red shirts or black shoes is 21.

How many people have black shoes?

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