Respuesta :

Answer:

d = 12

Step-by-step explanation:

6d + 6 - 2d = 54

4d + 6 = 54

4d = 48

d = 12

Answer:

6(d+1) - 2d = 54

6d + 6 - 2d = 54

4d + 6 = 54

4d = 54 - 6

d = 48/4

d = 12