The inequality is .

Apply addition property of inequality: Add 7 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 less than or equal to -1 in .

             (Substitute )

                   (Substract: )

The inequality is true.

The inequality solution set is .