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Addition and Subtraction

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  • ( 12 - 5 ) - 4 =
    3
  • 20 - 5 =
    15
  • 2 + ( 5 + 4 ) =
    11
  • 11 + 7 =
    18
  • 17 - 10 =
    7
  • 9 - 3 =
    6
  • 10 - 5 =
    5
  • ( 5 + 5 ) + 2 =
    12
  • ( 4 + 6 ) + 4 =
    14
  • 14 + 5 =
    19
  • 8 - 3 =
    5
  • 20 - 6
    14
  • 3 + ( 4 + 6 ) =
    13
  • 8 + 2 =
    10
  • 12 + 5 =
    17
  • 12 - 6 =
    6
  • ( 17 - 10 ) - 7 =
    0
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