
5 + (-8)
3
-3
13
-13
-3 + 4
Simplify: 




-7 + (-5)
Simplify: 
0
3
1
undefined
-9 - (-6)
-12 - 3
7 - (-9)
Simplify:




9-23
0 - 2
2
0
-2
1
Simplify: