10. Решите уравнение: 1) 6x = 28 - x; 2) 9x - 26 = 30 - 5x; 3) 7 - 3x = 6x – 56;

Решение:

1. 1) \( 6x = 28 - x \)
   \( 6x + x = 28 \)
   \( 7x = 28 \)
   \( x = \frac{28}{7} \)
   \( x = 4 \)
2. 2) \( 9x - 26 = 30 - 5x \)
   \( 9x + 5x = 30 + 26 \)
   \( 14x = 56 \)
   \( x = \frac{56}{14} \)
   \( x = 4 \)
3. 3) \( 7 - 3x = 6x - 56 \)
   \( 7 + 56 = 6x + 3x \)
   \( 63 = 9x \)
   \( x = \frac{63}{9} \)
   \( x = 7 \)

Ответ: 1) \( x=4 \); 2) \( x=4 \); 3) \( x=7 \).