The equation is

Apply addition property of inequality: Add 2.1 to each side.

                                       (Additive inverse property: )

                                             (Additive  identity property : )

                                                    (Add: ) 

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 24.1, a number and less than 24.1, in .

                                         (Substitute )

                                                        (Subtract : )

The inequlity is true.

The inequality solution is .