6 - 1 + ? = 7, 15 - 4 + ? = 19, 2 - ? + 3 = 5, 10 - 3 + ? = 13, 7 - 10 + ? = 17, 1 - 19 + ? = 20, 5 - 3 + ? = 8, 9 - ? + 1 = 10, 8 - ? + 1 = 9, 0 - ? + 5 = 5, 4 - 2 + ? = 6, 3 - ? + 10 = 13, 13 - 4 + ? = 17, 11 - ? + 8 = 19, 14 - 2 + ? = 16,

Subtraction Problems with Unknowns

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