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  • ? = 5 + 4
    9
  • 7+ ? = 11
    4
  • 0 = ? - 5
    5
  • 10 = ? + 4
    6
  • 12 = 6 + ?
    6
  • 13 = ? + 3
    10
  • 9 = 3 + ?
    6
  • 10 = 8 - ?
    2
  • ? = 8 - 6
    2
  • ? = 7 - 3
    4
  • ? = 5 + 3
    8
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