The inequality is .

  (Apply distributive property: )

             (Multiply: )

Apply addition property of inequality: Add 3.5 to each side.

       (Apply additive inverse property: )

             (Apply additive identity property: )

                      (Add: 21.7 + 3.5 = 25.2)

Apply division property of inequality: Divide each side by 1.4.

                         (Cancel common terms)

                               (Divide: )

Check:

To check, substitute three different values for m into the original inequality: 18, a number less than 18, and greater than 18.

Let three values are .

If then (This is false)

If then (This is true)

If then (This is true).

The inequality solution set is  .