2 +3 = - 5, 1 + 3 =  - 4, 9 + 4 = - 13, 9 + 5 = - 14, 26 + 4 =  - 30, 21 + 10 =  - 31, 13 + 4 =  - 17, 25 + 15=  - 40, 10 + 6 = - 16, 22 + 4 =  - 26,

addition subtraction match up

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