12 - ____ = 5, 5, 7, ____ - 3 = 12, 15, 10, 13 - ____ = 11, 2, 10, ____ - 3 = 14, 17, 12, 10 + ____ = 18, 8, 9, ____ + 2 = 25, 23, 21, 20 + ____ = 24, 4, 28, ____ + 6 = 25, 19, 30

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