Answer:
If you cut along the dotted line and remove the pieces you cut off, fold the sides inward and you get a moving box.
Each dotted line is 2 feet long, and each un-dotted line is also two feet.
Good luck, I hope this helps because honestly I just tried to figure it out for an hour. Lol.
-6(5x-4)= -156
WORK
-(6 times 5x - 6 times 4)= -156
-(30x - 24)= -156
(-30x + 24) + (-24) = -156 + (-24)
-30x + 24 - 24= -156 - 24
-30x= -180
and cetera