The replacement set is

Replace x in  with each value in the replacement set and check whether the

equation is true or not. \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ x \	\ \	\ True or false \
\ 11 \	\ \	\ False \
\ 12 \	\ \	\ True \
\ 13 \	\ \	\ False \
\ 14 \	\ \	\ False \
\ 15 \	\ \	\ False \

\

 Since x = 12 makes the equation true, the solution of   is 12. 

The solution set is .