Respuesta :

4w-7k=28
-4w     -4w

-7k=-4w + 28
/-7            /-7
k=0.57 + 4 
4w-7k=28
Subtract 4w from both sides
-7k=28-4w
Divide -7 from both sides to isolate k
k= -4 + 4/7w