1. 9 + 10 = 19
2. -15 - 20 = -35
3. 18 - 24 = -6
4. 12 - 13 = -1
5. -14 + 25 - 10 = 1
6. 10 - 15 + 19 - 13 = 1
1. 9 + 10 = 19
2. -15 - 20 = -35
3. 18 - 24 = -6
4. 12 - 13 = -1
5. -14 + 25 - 10 = 1
6. 10 - 15 + 19 - 13 = 1