2 - 5 + ___ = 7, 4 - 8 - ___ = 4, 3 - ___ + 3 = 6, 4 - 5 - ___ = 1, 3 - 7 + ___ = 10, 8 - 10 - ___ = 2, 5 - 4 + ___ = 9, 1 - 9 - ___ = 8, 8 - 4 + ___ = 12, 1 - 6 - ___ = 5,

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