The original function is

Write as or

First solve the case .

According to addition property of equality: if a = b, then a + c = b + c.

             (Add 8 to each side)

                   (Additive inerse property: )

                         (Additive identity property: ) 

                             (Add: )

                        (Divide each side by 2)

                              (Cancel common terms)

                                   (Divide: )

Next solve the case .

          (Add 8 to each side)

                (Additive inerse property: )

                      (Additive identity property: ) 

                                (Add: )

                           (Divide each side by 2)

                                   (Cancel common terms)

First, draw a number line.

To graph the solutions set, mark the numbers –13 and 7 on number line.

The solution set is .