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 .