Ответ:

Решение:

  1. a) (y + 4) - (y - 1) = 6y
    y + 4 - y + 1 = 6y
    5 = 6y
    \( y = \frac{5}{6} \)
  2. б) 3p - 1 - (p + 3) = 1
    3p - 1 - p - 3 = 1
    2p - 4 = 1
    2p = 5
    \( p = \frac{5}{2} \)
    \( p = 2,5 \)
  3. в) 6x - (7x - 12) = 101
    6x - 7x + 12 = 101
    -x + 12 = 101
    -x = 101 - 12
    -x = 89
    \( x = -89 \)
  4. г) 20x = 19 - (3 + 12x)
    20x = 19 - 3 - 12x
    20x = 16 - 12x
    20x + 12x = 16
    32x = 16
    \( x = \frac{16}{32} \)
    \( x = 0,5 \)

Ответ: а) \(\frac{5}{6}\); б) 2,5; в) -89; г) 0,5.