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  • 20-5=
    15
  • 27+3=
    30
  • 50+20=
    70
  • 30+20=
    50
  • 50-20=
    30
  • 10+10=
    20
  • 60-20=
  • 30+30=
    60
  • 45+55=
    100
  • 10+5=
    15
  • 35+30=
    65
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