The inequality is .

Apply addition property of inequality: Add 9.3 to each side.

       (Apply additive inverse property:  )

             (Apply 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 a number  greater than or equal to 21.8 in .

        (Substitute )

                 (Sustract: )

The inequality is true.

The inequality solution set is .