6 - 7 = 1 + ?, 5 - 7 = 2 + ?, 4 - 7 = 3 + ?, 3 - 7 = 4 + ?, 2 - 7 = 5 + ?, 1 - 7 = 6 + ?, 0 - 7 = 7 + ?,

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