8 - 2 - 5 + 1, 20 - 8 = - 10 + 2, 14 + 6 = - 18 + 2, 30 - 15 - 10 + 5, 16 + 8 = - 20 + 4, 7 + 7 + 7 + 7 = - 30 - 2, 54 + 9 = - 63, 108 + 12 = - 120,

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