9
-7
22
11
0
-31
3
-99
5
-60
-15
18-9=9
-21+14=-7
53-31=22
32-21=11
45-45=0
0-31=-31
-81+81=0
20-17=3
0-99=-99
30-25=5
10-70=-60
16-31=-15
9
-7
22
11
0
-31
0
3
-99
5
-60
-15
18-9=9
-21+14=-7
53-31=22
32-21=11
45-45=0
0-31=-31
-81+81=0
20-17=3
0-99=-99
30-25=5
10-70=-60
16-31=-15