The inequality .

Solve inequality.

                                                          (Original inequality)

                                             (Add to each side)

                                                                (Apply additive inverse property: )

                                            (multiply each side by )

                                                               (Cancel common terms)

Therefore, the solution set is .

Check:

Let three values and are substitute in the original inequality .

If then     (This is true)

If then     (This is false)

The solution set is .