Answer:
1. True
2. False
3. False
4. True
5. False
Explanation:
1. 7 = (-5) - (-12)
7 = -5 + 12
7 = 7
2. -5 - 12 = -17
-5 - (-12) = 7
3. -12 - 5 = -17
4. 7 = 7
5. -17 = 7
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