10+ 5 = - 15, 9+ 6 = - 15, 8+ 4 = - 12, 7+ 3 = - 10, 9+ 7 = - 16, 10 + 3 = - 13, 20 - 5 = - 15, 15- 6 = - 9, 10 - 1 = - 9, 13- 7 = - 6, 20- 0 = - 29, 8 - 4 = - 4, 8- 2 = - 6, 7- 2 = - 5, 6- 3=  - 3, 5+ 1 = - 6, 4 + 3=  - 7, 3 + 1 = - 4, 8 + 0=  - 8, 8 - 8= - 0,

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