Explanation:
I just answered this question. how often did you post it ?
in short again :
360 = 8x + 20 + 104 + arc angle KJP
arc angle KJP = 2× opposite angle of K and P =
= 2×(5x + 1)
so, together
360 = 8x + 124 + 2×(5x + 1) = 8x + 124 + 10x + 2 =
= 18x + 126
234 = 18x
x = 13