BRAINLIEST FOR BEST AND CORRECT ANSWER. Please show your work. Thank you!

since this is a six sided figure the sum of the interior angles is 720
75+130+ 125+ x+115+145 = 720 ( x in the interior angle left in the polygon)
590+ x=720
x = 130
x+y = 180 it makes a straight line
130+ y = 180
y = 50