The original function is

Write as or

First solve the case .

Apply Addition property of equality: if a = b, then a + c = b + c.

                    (Add 2 to each side)

                          (Additive inerse property: )

                                (Additive identity property: )

                                      (Add: )

                           (Multiply each side by 2)

                                     (Cancel common terms)

                                             (Multiply: )

                                  (Multiply each side by negative one)

                                           (Product of two same signs is positive)

Next solve the case .

                 (Add 2 to each side)

                      (Additive inerse property: )

                            (Additive identity property: )

                                     (Add: )

                         (Multiply each side by 2)

                                    (Cancel common terms)

                                        (Multiply: )

                          (Multiply each side by negative one)

                                              (Product of two same signs is positive)      

First, draw a number line.

To graph the solutions set, mark the numbers -24 and  16 on number line.

The solution set is .