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Review 1-30

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  • 0-0-0-0-0-0-0+20
    20
  • 10+20-20+10
    20
  • 2+2-2+2-2
    2
  • 23-9
    14
  • 9+9-8+16
    26
  • 12+12
    24
  • 9-8+9
    10
  • 1+1+1+2+2+2+3+3+3+4
    22
  • 11+11-1
    21
  • 15+15-9+0-1-20
    0
  • 1+2+3+4+5+6+7
    28
  • 12+18-30+9
    9
  • 10-10+10-10+10
    10
  • 18+12-14
    16
  • 7+5+9-8-8
    5
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