Answer: x=12
Explanation:
We know both expressions added together are equal to 180 degrees. So we can write the expression (7x+24)+72=180.
Now, for this next part remember what you do to one side, you have to do to the other. So we are going get rid of the 72 by subtracting it from both sides.
(7x+24)+72-72=180-72
Gives us the following: 7x+24=108
Now were gonna get rid of the 24 by doing the same thing.
7x+24-24=108-24
Gives us 7x=84.
Now we're going to divide both sides by 7.
This gives us x=12