Answer:
88
Explanation:
first the measure of angle FGE = 180-38-(6x-10)
= 142-6x+10
=152-6x
angle FGE + angle FGN = 180
152-6x + 7x+18 = 180
170 + x = 180
x = 10
So FGN = 7(10) + 18 = 70+18 = 88
Check that the triangle adds to 180 when x = 10:
(6x-10) + 38 + (152-6x) = 6(10)-10+38+152-6(10) = 180