Решите уравнение: a) 5x - 6 - (3 - 2x) = 5,7; б) 3,4y - 4 - (9,4y + 2) = 4y - 3.

Решение:

1. а) \( 5x - 6 - (3 - 2x) = 5.7 \)
   \( 5x - 6 - 3 + 2x = 5.7 \)
   \( 7x - 9 = 5.7 \)
   \( 7x = 5.7 + 9 \)
   \( 7x = 14.7 \)
   \( x = \frac{14.7}{7} \)
   \( x = 2.1 \)
2. б) \( 3.4y - 4 - (9.4y + 2) = 4y - 3 \)
   \( 3.4y - 4 - 9.4y - 2 = 4y - 3 \)
   \( -6y - 6 = 4y - 3 \)
   \( -6 + 3 = 4y + 6y \)
   \( -3 = 10y \)
   \( y = \frac{-3}{10} \)
   \( y = -0.3 \)

Ответ: а) x = 2.1; б) y = -0.3.