The inequality is .

    (Apply commutative property of addition: )

             (Add: )

Apply addition property of inequality: Add 13 to  each side.

      (Apply additive inverse property: )

             (Apply additive identity property: )

                      (Add: )

Graph the solution set on a number line.

Note: A circle means that this point is not included in the solution set.

Check:

To check, substitute a number less than 51 in inequality .

  (Substitute )

           (Add: )

                    (Subtract: )

The inequality is true.

The inequality solution set is .