Set the equation inside the absolute value brackets equal to 12 and -12, so you will end up with two answers. 7x+2=12 gives you 10/7 7x+2=-12 gives you -2. So your answers are 10/7 and -2
Well, since the actual size is 900 times as large as the size in blueprint, this would probably be division. If I'm right, you would first do 900 divide by 4 would equal to 225. so the actual size of the dining room is 225. I hope this helps...
