The image contains a list of algebraic equations with the instruction to solve them. Here is a transcription of the exercises:

12. Solve the equation:

1. $|7 - x| = -7$

2. $|x + 6| = x + 10$

3. $\sqrt{(x - 9)^2} = x - 9$

13. Solve the equation:

1. $x^2 - 12x + 11 = 0$

2. $x^2 - 15x + 56 = 0$

3. $6x^2 + 7x - 3 = 0$

4. $16x^2 + 8x + 1 = 0$

14. Solve the equation:

1. $x^4 - 10x^2 + 9 = 0$

2. $10x^4 + 7x^2 + 1 = 0$

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