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2. 28+(-13)= 15
3. -567+45= -522
4. -36+15= -21
5. -680+(-47)= -727
6. 34+(-123)=-89
5. 720+323= 1043
6. -240+(-187)= -427
7. 189+(-230)= -41
8. -24+24= 0
9. 189+(-189)= 0