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.
