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Answer:

Step-by-step explanation:

Thirty

5x - 4(3 + 2x) ≥ 9                   Remove the brackets

5x - 12 - 8x  ≥ 9

- 3x - 12  ≥ 9                           Add 12 to both sides

-3x  ≥ 9 + 12                           Combine

-3x  ≥ 21                                 Divide by - 3

x  ≥ 21/-3                               Whenever dividing by a minus, the plus minus is reversed.

x ≤ - 7

Thirty One

15x - 10 > 12x - 3                   Subtract 12x from both sides

15x - 12x - 10 > 12x-12x -3    Combine

3x -10 > -3                             Add 10 to both sides

3x > -3 + 10

3x > 7                                    Divide by 3. Don't reverse the >

x > 7/3

x > 2 1/3 or 2.33

Thirty Four

12x - 4 ≤ 20x - 20                Add 20 to both sides

12x - 4 + 20  ≤ 20x              Combine

12x + 16  ≤ 20x                    Subtract 12x from both sides

16  ≤ 4x                                Divide by 4

16/4  ≤ 4x/4

4  ≤ x

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