8 -6g + 15 = 19
You want to isolate the terms (separated by +) that doesn't have letters next to it, to the other side.
So, get 8 and 15 to the other side by subtracting both sides. They don't have letters next to them.
-6g =-4
Divide the -6 on both sides to get "g" alone.
g = 4/6
Simplify
g= 2/3