Simplify each expression.
1. 3x + 2 (5x - 7)
2. 9 - 3 (2x - 4)
3. 8x - 6 (3 - 2x)
4. - 5 + 5 (x + 4)
5. 4 (6n + 9) - 10n
6. 14 - 3 (4n - 1)
7. - 8n + 8 (4 + 2n)
8. 7k - 2 (3k + 1) - 9
9. k + 1 - 4 (2k - 9)
10. - 6 + 5 (8 - k) - 8k
11. - 10k - 3 + 2 (5 + 6k)
12. 8 + 9x + 4 (11 - 2x)
13. - 4 (2x - 7) + 6x - 7
14. 9 + 3 (4 - 3x) + 12x
15. 5 (2y - 4) + 2 (y + 9)
16. - 4 (3u - 1) + 7 (3 - 2u)
17. 6 (-5u + 1) - 3 (4u - 12)
18. - 3 (u + 5) + 8 (2u + 1)
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