The replacement set is 

Replace n in the equation with each value in the replacement set and check whether the equation is true or not. \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ n \	\       \	\        True or False \
\ 11 \	\ \	\ False \
\ 12 \	\ \	\ False \
\ 13 \	\ \	\ True \
\ 14 \	\ \	\ False \
\ 15 \	\ \	\ False \

\

 Since n=13 makes the equation true, the solution of   is 13.

The solution set is .