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-9, -8, -7, -6, -5, -4, -3, -2, -1, 0 1, 2, 3, 4, 5, 6, 7, 8, 9
La suma de -8 y
[1] su siguiente - 8 - 7 = -15
[2] su anterior -8 - 9 = -17
[3] su opuesto -8 + 8 = 0