5+3= - 8, 6+4= - 10, 10+4= - 14, 10+9= - 19, 5+0= - 5, 1+8= - 9, 4-4= - 0, 8-2= - 6, 10-3= - 7, 2-0= - 2, 10-9= - 1, 20-5= - 15,

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