Isolate the w. Note the equal sign. What you do to one side, you do to the other.
First, multiply w to both sides
(V/w)w = 9(w)
V = 9w
Next, Isolate the w. Divide 9 to both sides
V(/9) = 9w(/9)
w = V/9
w = V/9 is your answer
hope this helps
