In this case, you first have to make the right side of the equal sign one number, so you'd have to do 30 - 30 which equals 0. Now you divide 30 from both sides of the equal sign, in order to get x by its self. Since you can't divide 0 by 30, your answer will just be 0/30.
So x = 0/30 or 0 .
I really hope this makes sense, and if you like this answer can you please mark me brainliest, I only need one more to reach my goal? :)