Khan academy question multiple choice

C: 3x + 80 + 2x = 180

Step-by-step explanation:

A straight line is equal to 180 degrees total the find x, you would add the number within the line and make it equal to 180.

3x + 80 + 2x = 180

add like terms

5x + 80 = 180

subtract 80 from each side

5x = 100

divide each side by 5

x = 20