The top right angle is given as 50 degrees.
Because the two sides are identical and Line LC is a bisector, the top left side angle must also be 50 degrees.
Set the given equation equal to 50 and solve:
6n -10 = 50
Add 10 to both sides:
6n = 60
Divide both sides by 6:
n = 60/6
n = 10
m∠RLU = 50
n = 10