3 8 5 + 4 7 2, 2 7 9 + 1 6 7, 8 4 6 - 2 6 4, 7 3 5 - 3 1 7, 1 8 4 + 2 4 8, 8 2 6 - 4 6 9, 2 8 8 + 3 5 6, 9 5 3 - 6 8 6.

addition and Subtraction

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