Respuesta :

(3x+3) + (4x + 2)
------------------------- = 13
2

13(2) = (3x+3) + (4x+2)

26 = 3x + 3 + 4x + 2

26 = 7x + 5

26-5 = 7x

21 = 7x

x = 21 ÷ 7

x = 3