The replacement set is .
Replace c in the equation with each value in the replacement set and check
\whether the equation is true or not.
\\
\
c \ \ \ | \
\
| \
\
True or False \ | \
\
11 \ | \
\
| \
\
False \ | \
\
12 \ | \
\
| \
\
False \ | \
\
13 \ | \
\
| \
\
False \ | \
\
14 \ | \
\
| \
\
True \ | \
\
15 \ | \
\
| \
\
False \ | \
Since c = 14 makes the equation true, the solution of is 14.
The solution set is {14}.