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1.9
2.13
3.4
4.28
2. -9 + 12 - (-10) = -9 + 12 + 10 = 3 + 10 = 13
3. -9 - (8) + 21 = -17 + 21 = 4
4. 15 + 12 - (-8) + (-7) = 15 + 12 + 8 - 7 = 27 + 8 - 7 = 35 - 7 = 28