1. -5x - 9 = -6x - 10 2. 4x = 7 + 3(4x + 3) 3. 5(3x + 1) + 2x = 4x + 5

Решение:

1. \( -5x - 9 = -6x - 10 \)
   \( -5x + 6x = -10 + 9 \)
   \( x = -1 \)
2. \( 4x = 7 + 3(4x + 3) \)
   \( 4x = 7 + 12x + 9 \)
   \( 4x - 12x = 16 \)
   \( -8x = 16 \)
   \( x = -2 \)
3. \( 5(3x + 1) + 2x = 4x + 5 \)
   \( 15x + 5 + 2x = 4x + 5 \)
   \( 17x + 5 = 4x + 5 \)
   \( 17x - 4x = 5 - 5 \)
   \( 13x = 0 \)
   \( x = 0 \)

Ответ: 1. x = -1; 2. x = -2; 3. x = 0.