90 degrees + 5x + x needs to equal 180 degrees cant figure out the variables though

X=15

90 + 5 (15) + 15 = 180

90 + 75 + 15 = 180

180 = 180

To get 15, I added up the the x's (which was 6 total), and divided 90 by them.

90/6 = 15

Then you just fill them into the equation.

Have a superb day!