(7+1)-3= - 5, (5+6)-5= - 6, (3+3)-2= - 4, (2+3)-4= - 1, (2+2)-1= - 3, (8+1)-(4+3)= - 2, (10+10)-(1+2)= - 17, (20+9)-(10+6)= - 13, (30+5)-(11+5)+6= - 25, (40+7)-(14+1)+8= - 40,

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