7 + ___ = 12, 4, 7, 6, 5, 15 - ___ = 9, 6, 5, 8, 7, ___ + 6 = 14, 7, 10, 8, 9, 18 - ___ = 5, 12, 13, 11, 14, 4 + ___ = 11, 9, 8, 7, 6, ___ - 3 = 10, 12, 13, 11, 14, 9 + ___ = 17, 8, 6, 9, 7, 20 - ___ = 8, 11, 10, 13, 12, ___ + 5 = 13, 6, 9, 8, 7, 16 - ___ = 7, 9, 8, 10, 7, 2 + ___ = 9, 6, 7, 8, 5, ___ - 6 = 12, 16, 17, 19, 18

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