easy numbers
8 + -3
-4 + 7 =
-13 + 13
-12 + -3
9 + -3
-6 + -7
0 + -9
-4 + -8
5 + -9
-15 + 2
-8 + 12
19 + 17
-21 + -14
8 + -20
-13 + 17