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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