(40 - 4x) : 2 = 16

Решение:

1. \( (40 - 4x) : 2 = 16 \)
2. \( 40 - 4x = 16 \cdot 2 \)
3. \( 40 - 4x = 32 \)
4. \( 40 - 32 = 4x \)
5. \( 8 = 4x \)
6. \( x = \frac{8}{4} \)
7. \( x = 2 \)

Ответ: 2