You must distribute and then get w by itself, Camella.
-8w + 2(w+8) = -26 now distribute
-8w + 2w + 16 = -26 now combine like terms
-6w + 16 = -26 now move the 16 to the other side by subtracting 16 from both sides
-6w = -42 now isolate w by dividing both sides by -6
w = 7