7. Solve the equations:

Решение:

1. \(72 - x = 41\)
   \(x = 72 - 41\)
   \(x = 31\)
2. \(x \cdot 3 = 75\)
   \(x = 75 : 3\)
   \(x = 25\)
3. \(45 : x = 9\)
   \(x = 45 : 9\)
   \(x = 5\)

Ответ: x = 31, x = 25, x = 5.