Linear pairs add up to 180 degrees because they make a straight line and a line is half of a circle (360). To solve add both sides and set equal to 180 and simplify.
5x +5+11x-65=180.
5x+ 5 + 11x -65=180
16x -60=180
+60. +60
16x=240
/16. /16
X= 15
Then plug in x for the angle you need to find.
11x-65
11(15)-65
100
So now you know that RQS=100 degrees