Zoom bomb this les go

What does x = in this equation x+3+2x=x+5

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box