30) x/8 + 11 = 0 31) x/4 = 3/2 + x/8 32) x/16 + 2 = x/4

Решение:

• 30. \(\frac{x}{8} + 11 = 0\)
  \[ \frac{x}{8} = -11 \]
  \[ x = -11 \times 8 = -88 \]
• 31. \(\frac{x}{4} = \frac{3}{2} + \frac{x}{8}\)
  Умножим обе части на 8:
  \[ 8 \times \frac{x}{4} = 8 \times \frac{3}{2} + 8 \times \frac{x}{8} \]
  \[ 2x = 12 + x \]
  \[ 2x - x = 12 \]
  \[ x = 12 \]
• 32. \(\frac{x}{16} + 2 = \frac{x}{4}\)
  Умножим обе части на 16:
  \[ 16 \times \frac{x}{16} + 16 \times 2 = 16 \times \frac{x}{4} \]
  \[ x + 32 = 4x \]
  \[ 32 = 4x - x \]
  \[ 32 = 3x \]
  \[ x = \frac{32}{3} \]

Ответ: 30) \(x = -88\); 31) \(x = 12\); 32) \(x = \frac{32}{3}\)