8*(n+6)=80
distribute
8n+48 = 80
subtract 48 from each side
8n = 32
divide by 8
n=4
the missing number is 4.
8*(x+6)=80
divide both sides by 8
x+6=10
subtract 6 from both sides
x=4.
hope i was able to help. god bless. :D
