Answer:
On one side of the equation you have x+5 and on the other you have 12.
this is the same as saying x plus a number equals 12. In order to find out what x is, you have to get rid of the 5 on each side of the equation. that way, you can see the difference between the numbers 12 and 5. if you use the model, you can take away 5 from the right side and do the same to the left side. this will leave you with x= 7. Now you know that the equation is that x=7.
Explanation: