The inequality is .

Apply multiplication property of inequality: Multiply each side by 2.

                     (Cancel common terms)

                           (Multiply: )

             (Multiply each side by negative one and flip the symbol)

                                 (Product of two same signs is positive)

Graph the solution set on a number line.

Note: A dot means that this point is included in the solution set.

Check:

To check, substitute 20, a number greater than 20, in .

                        (Substitute )

                                (Divide: )

The inequality is true.

The inequality solution is .