3. Решите уравнения a) 8(2x - 1) =24 b) 7x-3(2x - 5) = 17 c) 0,1(30x – 10) = 26

Решение:

1. a) 8(2x - 1) = 24
   

   \( 16x - 8 = 24 \)

   
   

   \( 16x = 24 + 8 \)

   
   

   \( 16x = 32 \)

   
   

   \( x = \frac{32}{16} \)

   
   

   \( x = 2 \)

   
   


2. b) 7x - 3(2x - 5) = 17
   

   \( 7x - 6x + 15 = 17 \)

   
   

   \( x + 15 = 17 \)

   
   

   \( x = 17 - 15 \)

   
   

   \( x = 2 \)

   
   


3. c) 0,1(30x - 10) = 26
   

   \( 3x - 1 = 26 \)

   
   

   \( 3x = 26 + 1 \)

   
   

   \( 3x = 27 \)

   
   

   \( x = \frac{27}{3} \)

   
   

   \( x = 9 \)

   
   

Ответ: a) x = 2, b) x = 2, c) x = 9.