( -9 ) + ( 10 )
19
-19
1
-1
21
-21
( 7 ) + ( -3 )
10
-10
4
-4
( -8 ) + ( 6 )
-14
14
-2
2
( -9 ) - ( 7 )
16
-16
( 3 ) - ( -8 )
5
-5
11
-11