16 - 7 + 9 =, 4 - 1 + 3 =, 17 - 2 + 15 =, 7 - 1 + 6 =, 6 - 5 + 1 =, 18 - 16 + 2 =, 20 - 10 + 10 =, 13 - 4 + 9 =, 19 - 19 + 0 =, 9 - 3 + 6 =,

Addition to 20

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