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2. + (15-7)= 8
3. + (15-10)= 5
4. 19-6= 13
5. -10-7 = -17
6. -(18-10) = -8
7. -16 - 11= -27
8. 14-8 = 6
9. 4-17 = -13
10. + ( 18-13 ) = 5