10-9= - 1, 9 -7= - 2, 9 -5= - 4, 12+1= - 13, 9 -3= - 6, 15 -1= - 14, 2+6= - 8, 1+8= - 9, 5+5+1= - 11, 12+2+1= - 15,

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