Help with this problem , I got 14 but I was told it’s wrong

Answer:
128 degrees.
Step-by-step explanation:
Applying the exterior angle theorem
m<x = m<z + m<y
198 - 5n = 5n + 37 + n + 7
-5n - 5n - n = 37 + 7 - 198
-11n = -154
n = 14
So remote exterior angle x = 198 - 5(14)
= 128.