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Simplifying Expressions and Solving Equations and Inequalities

Simplify the following expressions:

16. 4[x - 2(x - 3)]

17. 5[2x - (x + 3)] - (4 - x)

Solve the following equations & inequalities for x:

18. 7 - 5(x - 3) + 4 = 2 + 3(x + 4)

19. (x + 2) / 3 = (x - 1)/4

20. 2x - 6 > 4(-3 + x)

21. -4x + 6 -3x + 4 < 3(4 + x) - 6

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