So first we need to solve whatever that is in the brackets.
Distribute the negative sign to both 6x and -6.
U will get 7 - 6x + 6 which equals to 13 - 6x.
Now we must distribute the 8 to both 13 and -6x.
This results in 104 - 48x.
Now u have 104 - 48x + 6x = 0
Combine -48x + 6x and subtract 104 on both sides.
-42x = -104
X = 52/21