8 + 8 (8 - n) = 40 + 8n

n=2

8+8 (8-n) = 40+8n (distribute 8 through the parenthesis)

8+64-8n=40-8n (add the numbers)

72-8n=40+8n (move the variable to the left side and change its sign)

72-8n+8n=40

-8n+8n=40-72 (connect like terms)

-16n = - 32 (divide both sides by - 16)

n=2

8 + 8 (8 - n) = 40 + 8n

8 + 64 - 8n = 40 + 8n distributed 8 on the left side

72 - 8n = 40 + 8n added like terms on the left side

32 - 8n = 8n subtracted 40 from both sides

32 = 16n added 8n to both sides

2 = n divided both sides by 2

Answer: n = 2