12 - ? = 10 - 2, 7 + ? = 10 - 3, 8 - ? = 3 - 5, 5 + ? = 8 - 4, 7 - ? = 6 - 1, 10 - ? = 4 - 6, 4 + ? = 11 - 7, ? - 3 = 5 - 8,

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