Answer:
x=11 again
Explanation:
Like the previous problem, the interior angles of a triangle add up to 180 (well, it's always true but whatever), so you want to find angle GFH (the acute angle at F) to complete your information. 180-137=43, so angle F equals 43
The sum of angles F, G, and H equal 180, so add them all up
This gives 10x+70, set this equal to 180
10x+70=180
Solving gives 10x=110
x=11
(Once again wow)