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

Find the missing number (7)

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