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  • 20-10 =
    10
  • 5-5=
    0
  • 23-3 =
    20
  • 12-4=
    8
  • 10-8=
    2
  • 15-5=
    10
  • 13-7=
    6
  • 50-10 =
    40
  • 90-50 =
    40
  • 10-4=
    6
  • 17-7 =
    10
  • 5-4=
    1
  • 7-4=
    3
  • 16-3 =
    13
  • 49-9 =
    40
  • 60-20 =
    40
  • 30-20 =
    10
  • 8-4=
    4
  • 14-7 =
    7
  • 12-8=
    4
  • 15-5 =
    10
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