the example is how you are supposed to answer, please follow it and do ALL of the things including the check. don't do the examples

Answer:
1.) 8
2.) 23
3.) -7
Step-by-step explanation:
1.) x + 2 = 10 2.) y - 8 = 15 3.) a + 9 = 2
- 2 -2 + 8 +8 - 9 -9
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x + 0 =8 y - 0 = 23 a + 0 = -7