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  • 80- 60 = 70 - __
    50
  • 20 - __ = 40 - 20
    0
  • 100 - __ = 10 + 50
    40
  • 50 + __ = 20 + 70
    40
  • __ + 30 = 40 + 40
    50
  • 60 + __ = 50 + 40
    30
  • 60 - __ = 70 - 40
    30
  • 40 + 50 = __ + 20
    70
  • 70 + __ = 10 + 80
    20
  • 100 - 20 = ___ + 30
    50
  • 100- 50 = __ + 20
    30
  • 70 - 40 = __ + 10
    20
  • 90 - 70 = __ + 10
    10
  • __ + 60 = 0 + 100
    40
  • 70 - __ = 30 + 40
    0
  • 30 + __ = 50 + 50
    70
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