(13 - 2x) * 3 = 27

Решение:

1. \( (13 - 2x) \cdot 3 = 27 \)
2. \( 13 - 2x = \frac{27}{3} \)
3. \( 13 - 2x = 9 \)
4. \( 13 - 9 = 2x \)
5. \( 4 = 2x \)
6. \( x = \frac{4}{2} \)
7. \( x = 2 \)

Ответ: 2