___ − 8 = 6          8 + 6 = ___

___ − 6 = 8          6 + 8 = ___

15 − ___ = 7          ___ + 7 = 15

15 − 7 = ___          7 + ___ = 15

___ − 8 = 8          8 + 8 = ___

12 − ___ = 5          ___ + 5 = 12

12 − 5 = ___          5 + ___ = 12

___ − 7 = 6          7 + 6 = ___

___ − 6 = 7          6 + 7 = ___