Find the value of x

Since 6x and 5x+15 are both 90 degree angles, they equal each other....
6x = 5x+15 (Subtract 5x from both sides to get x alone)
x=15
Answer:
x = 15
Step-by-step explanation:
Each angle looks to be equal to 90 degrees. To find out what x equals on one side we can do 90/6 and then we get 15 degrees. We can plug 15 into the second equation. (5*15)+15. We also get 90 degrees.