Resposta: A) 27/29

B) 3

C) 4/7

D) -2

Explicação passo a passo:

A) 13+4 (2×-1) = 5 (x+2)    

   26x - 13 + 8x - 4 = 5x + 10

    34x - 17 = 5x + 10  

    34x - 5x = 10 + 17  

    29x = 27

         x = 27/29

B) 2 (x+5) -3 (5-x) = 10

   2x + 10 -15 +3x = 10

   5x = 15

   x = 3

C) 8 ( x-1) = 8 - 4 (2x-3)

   8x - 8 = 8 - 8x + 12

    8x + 8x = 8 + 12 + 8

   16x = 28

    x = 16/28

   x = 4/7

D) 4 (x+5) +3 (x+5) = 21

   4x + 20 + 3x +15 = 21

   4x+3x = 21 - 20 - 15

   7x = -14

    x = -14/7

   x = -2