10 + 10 =  - 20, 60 - 30 = - 30, 90 : 10 = - 9, 60 + 10 = - 70, 5 x 3 =  - 15, 21 - 3 = - 18, 80 : 2 = - 40, 20 x 5 = - 100, 92 - 80 = - 12, 8 x 8 = - 64,

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