70 - 40 =  - 30, 20 + 20 =  - 40, 50 - 40 = - 10, 90 - 70 = - 20, 100 - 50 = - 50, 10 + 70 = - 80, 90 - 30 = - 60, 20 + 50 = - 70, 70 + 20 = - 90, 100 - 0 = - 100,

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