x = 10 - x + 2 = 12, x = 22 - x - 2 = 20, x = 35 - x - 20 = 15, x = 9 - 15 = x + 6, x = 45 - 30 = x - 15, x = 8 - x + 12 = 20, x = 40 - x - 30 = 10, x = 0 - 15 - x = 15, x = 69 - 50 = x -19, x = 18 - x - 6 = 12, x = 4 - x + 8 = 12, x = 17 - x + 3 = 20,

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