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10. 3(x - 4) - 7x = 8.
12. 3(2x + 5) - 2(3x + 1) = 2.
14. 5(x - 8) - 4(5x + 2) = 12.
16. 2x + 4(x - 3) = 5(x + 1) - 9.
18. x - 19 - 3(x - 2) = 3(4 - x).