Answer: x=30
Explanation:
You set up your equation: 5x+x=180
(180 because straight lines are equal to 180 degree's)
You add up the X's. (you would get 6x)
Your new equation is 6x=180
You have to get x by itself so you then divide by 6 on both sides.
When you do that you get x by itself and when you divide 180 by 6 you get the answer of thirty.
Final answer: x=30 degrees