Решение:
- \( 3412 - x = 1584 \)
\( x = 3412 - 1584 \)
\( x = 1828 \) - \( x : 23 = 104 \)
\( x = 104 \cdot 23 \)
\( x = 2392 \) - \( 1624 : x = 8 \)
\( x = 1624 : 8 \)
\( x = 203 \) - \( x \cdot 15 = 405 \)
\( x = 405 : 15 \)
\( x = 27 \)
Ответ: 1. x = 1828; 2. x = 2392; 3. x = 203; 4. x = 27.