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1. x=-6

2. x=12

3. x=8

4. x=-21

5. x=-18

6. x=-2

7. x=10

8. x=-3

9. x=21

10. x=2

11. x=-18

12. x=-7

13. x=6

14. x=-10

15. x=3

Step-by-step explanation:

Whew! That took a long time. I hope the answers are correct! The negatives  may be hard to see, though. Comment on this answer if you can't see them.