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2.-1
3.-17
4.3
5.-23
6.-10
7.-3
8.-2
9.-19
10.3
2. (-8) + 7 = -1
3. (-7) + (-10) = -17
4. 12 + (-9) = 3
5. (-13) + (-10) = -23
6. (-6) + (-4) = -10
7. (-10) + 7 = -3
8. 9 + (-11) = -2
9. (-8) + (-11) = -19
10. (-11) - (-14) = 3