6+6= - 12, 7+8 = - 15, 5+2= - 7, 10 +1= - 11, 20+5= - 25, 3+3= - 6, 4+9= - 13, 6+3 = - 9, 5+5= - 10, 3+2= - 5, 7-2= - 5, 5-2= - 3, 3-3= - 0, 9-5= - 4, 7-5= - 2,

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