How do i find x of a rectangle equation

The long sides are the same and the short sides are the same. add both of the long sides together. then add the short sides together. finally add both sums (perimeter)multiply the long end and short end. make sure not to add both of the sides (area)

1200 inches = 30 yards12 inches= 1 foot3 feet= 1 yard3feet= 36 inchesyou can set up a proportion then use inverse operations that looks sorry it looks so sloppy lol