4 + y = 11 , 7, -7, 15, -15, 10, non, y–4 =2, 6, -6, 2, 8, -8, non, 3+y =4, 1, 7, -7, 12, -2, non, y + 9 = 14, -5, 23, -23, 5, 4, non, 5–y =2, 7, -7, -3, 3, 10, non, 6 – y = -3, -9, 9, 3, -3, 18, non, y – 9 = -4, 13, -13, 5, -5, 36, non, 7 – y = -1, 8, -8, 6, -6, 7, non, y – 3 = -1, 2, 4, -4, -2, 8, non, 7–y =4, 3, 11, -11, -3, 28, non.

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