6s + 12 = 3(2s + 8)
Solve what is in the parenthesis first. To do this, multiply everything in the parenthesis by 3.
6s + 12 = 6s + 24
Subtract 12 from both sides.
6s = 6s + 12
Subtract 6s from both sides.
0 = 12
This means there is not solution.
Something that helped you get to this answer was by combining like terms.
Hope this helps!
