10
-2
(+8) - (-2) = +10
8
18
-18
10
10
The sum of 8 and 2 is 10
here are all the possible combinations 6(12)+8 6(10)+10(2) 6(9)+8(2)+10 6(8)+8(4) 6(7)+8+10(3) 6(6)+8(3)+10(2) 6(5)+8(5)+10 6(5)+10(5) 6(4)+8(2)+10(4) 6(4)+8(7) 6(3)+8(4)+10(3) 6(2)+8+10(6) 6(2)+8(6)+10(2) 6+8(3)+10(5) 6+8(8)+10 8(10) 8(5)+10(4) 10(8)
+10 + (-8) = +2+10 + (-8) = +2+10 + (-8) = +2+10 + (-8) = +2
2+8-10=0