What statement makes the open sentence 7x-7=2x+8 true?

If you answer right ill give brainliest, : )

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.