Answer:
tell him to add 5 negative x tiles to get all of the x's to one side of the equation. You need to do this because getting all the x's to one side will help you solve the equation because if all of the x's are on one side you can add or divide numbers to the other side and solve for x.
Explanation:
I don't know if this is what the learning platform is looking for but its the best way that i can explain it