Answer:
x=20
Explanation:
Let's start by looking at determining what we're working with here. As you can see we're working with a straight, horizontal line, which is a total of 180 degrees.
Now let's break it down.
You see that we are given the numbers 3x, 80, and 2x. We can combine it like so: 3x+2x+80.
Then, since we're working with a straight line here (180 degrees) we know that 3x+2x+80 HAS to equal 180 degrees.
So now we have our final equation 3x+2x+80=180.
Now to solve it, just combine like terms (3x+2x) to get 5x. Now we have 5x+80=180.
Subtract 80 from both sides to get 5x=100.
Divide 5 from both sides to get x=20.