9 – y = 0, 9, 9 + y = 0, -9, 9 – y = 2, 7, 9 + y = 2, -7, 19 – 2y = -1, 10, 19 +2y = -1, -10, 11– 2y = -1, 6, 11+2y = -1, -6, 8 – y = 6, 2, 8 +y = 6, -2

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