The length of a rectangle is 4 feet less than 3 times its width. The perimeter of the rectangle is 54 feet. Which equation can be used to find the width (w) of the rectangle?

A
2(3w−4)+2w=54

B
2(4w−3)+2w=54

C
w(3w−4)=54

D
(3w−4)+2w=54