Respuesta :

Here is what I would do, hope this helps.
Ver imagen egn007

8n-4=-2+n-6-8n

8n-4=-8-7n

15n-4=-8

15n=4

n=-2.66


13+4a+2a=3a+1

13+6a=3a+1

13+3a=1

3a=-12

a=-4