Respuesta :

Answer:

5

Step-by-step explanation:

42-(3c+4)=2(c+4)+c

42-3c-4=2c+8+c

42-4-3c=3c+8

38-3c=3c+8

38-3c-3c=8

38-6c=8

6c=38-8

6c=30

c=30/6

c=5