2. Решите уравнение: a) 7x - 4 = x - 16; б) 13 - 5x = 8 - 2x; в) 4y + 15 = 6y + 17;

Решение:

1. a) 7x - 4 = x - 16
   \( 7x - x = -16 + 4 \)
   \( 6x = -12 \)
   \( x = -2 \)
2. б) 13 - 5x = 8 - 2x
   \( -5x + 2x = 8 - 13 \)
   \( -3x = -5 \)
   \( x = \frac{-5}{-3} = \frac{5}{3} \)
3. в) 4y + 15 = 6y + 17
   \( 4y - 6y = 17 - 15 \)
   \( -2y = 2 \)
   \( y = -1 \)

Ответ: x = -2; x = 5/3; y = -1.