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

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