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Find the missing number

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  • 15 = _ - 30
    15
  • 5 + _ = 15
    10
  • 23 + 7 = 40 - _
    10
  • 52 - _ = 27
    25
  • _ + 4 = 105
    101
  • 45 - _ = 36
    9
  • 44 - _ = 18
    26
  • 26 + _ = 39
    13
  • 15 = 72 - _
    57
  • 21 + 4 = 75 - _
    50
  • 66 - _ = 33
    33
  • _ - 15 = 19
    34
  • 17 + _ = 52
    35
  • 42 = 5 + _
    37
  • _ + 55 = 83
    28
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